{"id":17158,"date":"2014-05-20T14:27:52","date_gmt":"2014-05-20T07:27:52","guid":{"rendered":"https:\/\/banbientan.com\/?p=17158"},"modified":"2014-05-20T14:27:52","modified_gmt":"2014-05-20T07:27:52","slug":"kien-thuc-co-ban-ve-bo-dem","status":"publish","type":"post","link":"https:\/\/hunglong.banbientan.com\/?p=17158","title":{"rendered":"Ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 b\u1ed9 \u0111\u1ebfm"},"content":{"rendered":"

B\u1ed9 \u0111\u1ebfm l\u00e0 thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ebfm s\u1ed1 l\u1ea7n ho\u1ea1t \u0111\u1ed9ng.<\/strong> N\u00f3 \u0111\u1ebfm s\u1ed1 l\u1ea7n ON\/OFF t\u1eeb thi\u1ebft b\u1ecb \u0111\u1ea7u v\u00e0o v\u00ed d\u1ee5 nh\u01b0 c\u00f4ng t\u1eafc ho\u1eb7c c\u1ea3m bi\u1ebfn.<\/span>
\nTrong b\u00e0i n\u00e0y, ch\u00fang ta s\u1ebd h\u1ecdc v\u1ec1 ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n trong vi\u1ec7c l\u1ef1a ch\u1ecdn v\u00e0 s\u1eed d\u1ee5ng b\u1ed9 \u0111\u1ebfm.<\/span>
\nV\u00ed d\u1ee5 v\u1ec1 c\u00e1c \u1ee9ng d\u1ee5ng b\u1ed9 \u0111\u1ebfm<\/a><\/object><\/strong><\/span><\/span><\/span><\/span>
\nCh\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u v\u1ec1 vi\u1ec7c \u1ee9ng d\u1ee5ng b\u1ed9 \u0111\u1ebfm trong t\u1ef1 \u0111\u1ed9ng h\u00f3a s\u1ea3n xu\u1ea5t.<\/span>
\nTrong v\u00ed d\u1ee5 n\u00e0y, b\u1ed9 \u0111\u1ebfm s\u1ebd \u0111\u1ebfm s\u1ed1 chai do b\u0103ng chuy\u1ec1n chuy\u1ec3n \u0111\u1ebfn v\u00e0 s\u1ebd gom 3 chai v\u00e0o m\u1ed7i h\u1ed9p \u0111\u1ef1ng.<\/span>
\nB\u1ed9 \u0111\u1ebfm l\u00e0m vi\u1ec7c theo c\u00e1ch th\u1ee9c nh\u01b0 sau:<\/p>\n
    \n
  1. \n
    Tr\u01b0\u1edbc ti\u00ean c\u00e0i \u0111\u1eb7t gi\u00e1 tr\u1ecb \u0111\u1eb7t b\u1ed9 \u0111\u1ebfm l\u00e0 3<\/span><\/div>\n<\/li>\n
  2. \n
    B\u1ed9 \u0111\u1ebfm sau \u0111\u00f3 s\u1ebd \u0111\u1ebfm s\u1ed1 t\u00edn hi\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c t\u1eeb c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n.<\/span><\/div>\n<\/li>\n
  3. \n
    B\u1ed9 \u0111\u1ebfm g\u1eedi t\u00edn hi\u1ec7u \u0111\u1ebfn c\u00e1nh tay robot m\u1ed7i khi gi\u00e1 tr\u1ecb \u0111\u1ebfm \u0111\u1ea1t s\u1ed1 3<\/span><\/div>\n<\/li>\n
  4. \n
    C\u00e1nh tay robot nh\u1eadn t\u00edn hi\u1ec7u t\u1eeb b\u1ed9 \u0111\u1ebfm v\u00e0 th\u1ef1c hi\u1ec7n gom 3 chai v\u00e0o 1 h\u1ed9p.<\/span><\/div>\n<\/li>\n<\/ol>\n

    B\u1ed9 \u0111\u1ebfm c\u00f3 gi\u00e1 tr\u1ecb \u0111\u1eb7t tr\u01b0\u1edbc (Preset) v\u00e0 b\u1ed9\"bo \u0111\u1ebfm t\u1ed5ng (Totalizer)<\/strong><\/span><\/span><\/span><\/span>
    \nB\u1ed9 \u0111\u1ebfm Preset nh\u1eadn gi\u00e1 tr\u1ecb \u0111\u1eb7t ho\u1eb7c gi\u00e1 tr\u1ecb m\u1ee5c ti\u00eau tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u ho\u1ea1t \u0111\u1ed9ng. B\u1ed9 \u0111\u1ebfm g\u1eedi t\u00edn hi\u1ec7u \u0111\u1ea7u ra <\/strong> khi gi\u00e1 tr\u1ecb \u0111\u1ebfm \u0111\u1ea1t t\u1edbi gi\u00e1 tr\u1ecb \u0111\u1eb7t. B\u1ed9 \u0111\u1ebfm v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 trong trang tr\u01b0\u1edbc c\u1ee7a b\u00e0i h\u1ecdc.<\/span>
    \nM\u1ed9t d\u1ea1ng kh\u00e1c c\u1ee7a b\u1ed9 \u0111\u1ebfm \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ed9 \u0111\u1ebfm t\u1ed5ng (Totalizer), ch\u1ec9 hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb \u0111\u1ebfm m\u00e0 kh\u00f4ng g\u1eedi \u0111i t\u00edn hi\u1ec7u \u0111\u1ea7u ra<\/strong>. B\u1ed9 \u0111\u1ebfm t\u1ed5ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi \u1ee9ng d\u1ee5ng ch\u1ec9 y\u00eau c\u1ea7u hi\u1ec3n th\u1ecb t\u1ed5ng s\u1ed1 s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c \u0111\u1ebfm trong 1 kho\u1ea3ng th\u1eddi gian do ng\u01b0\u1eddi v\u1eadn h\u00e0nh \u0111\u1eb7t tr\u01b0\u1edbc.<\/span>
    \nC\u00e1c b\u1ea1n c\u00f3 th\u1ec3\u00a0th\u1ea5y, b\u1ed9 \u0111\u1ebfm OMRON c\u00f3 2 lo\u1ea1i: 1 lo\u1ea1i c\u00f3 th\u1ec3 xu\u1ea5t t\u00edn hi\u1ec7u \u0111\u1ea7u ra, 1 lo\u1ea1i kh\u00f4ng xu\u1ea5t t\u00edn hi\u1ec7u \u0111\u1ea7u ra.<\/span><\/p>\n

    B\u1ed9 \u0111\u1ebfm H7EC-N<\/a>\u00a0B\u1ed9 \u0111\u1ebfm gi\u00e1 r\u1ebb H7CZ<\/a><\/h2>\n

    T\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o\u00a0<\/strong><\/span><\/span><\/span><\/span>
    \nB\u1ed9 \u0111\u1ebfm \u0111\u1ebfm s\u1ed1 l\u1ea7n thi\u1ebft b\u1ecb \u0111\u1ea7u v\u00e0o chuy\u1ec3n tr\u1ea1ng th\u00e1i ON v\u00e0 OFF. T\u00edn hi\u1ec7u ON\/OFF n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1ed9t xung<\/span><\/strong>.\"xung<\/span>
    \nGi\u00e1 tr\u1ecb \u0111\u1ebfm hi\u1ec7n t\u1ea1i thay \u0111\u1ed5i theo s\u01b0\u1eddn l\u00ean<\/strong> c\u1ee7a t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o (\u0111\u01b0\u1ee3c ch\u1ec9 ra trong b\u1ea3ng bi\u1ebfn thi\u00ean th\u1eddi gian).<\/span>
    \nKhi gi\u00e1 tr\u1ecb \u0111\u1eb7t c\u1ee7a b\u1ed9 \u0111\u1ebfm l\u00e0 3, b\u1ed9 \u0111\u1ebfm s\u1ebd g\u1eedi t\u00edn hi\u1ec7u \u0111\u1ea7u ra t\u1ea1i th\u1eddi \u0111i\u1ec3m s\u01b0\u1eddn l\u00ean th\u1ee9 3 c\u1ee7a t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o.<\/span>
    \nTh\u1ebf n\u00e0o \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1ed9t xung?<\/span>
    \nM\u1ed9t xung l\u00e0 m\u1ed9t t\u00edn hi\u1ec7u trong kho\u1ea3ng th\u1eddi gian ng\u1eafn. Xung \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 xung tu\u1ea7n ho\u00e0n khi tr\u1ea1ng th\u00e1i ON\/OFF \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i tu\u1ea7n t\u1ef1.<\/span>
    \n    \"xung\"<\/a>
    \nC\u00e1c d\u1ea1ng \u0111\u1ea7u v\u00e0o (\u0110\u1ea7u v\u00e0o d\u1ea1ng NPN v\u00e0 PNP)<\/strong><\/span><\/span><\/span><\/span>
    \nB\u1ed9 \u0111\u1ebfm nh\u1eadn t\u00edn hi\u1ec7u t\u1eeb thi\u1ebft b\u1ecb \u0111\u1ea7u v\u00e0o theo hai d\u1ea1ng: NPN (\u0111\u1ea7u v\u00e0o kh\u00f4ng \u0111i\u1ec7n \u00e1p) v\u00e0 PNP (\u0110\u1ea7u v\u00e0o c\u00f3 \u0111i\u1ec7n \u00e1p).
    \nC\u1ea3 hai d\u1ea1ng \u0111\u1ea7u v\u00e0o PNP v\u00e0 NPN \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng d\u1ef1a theo ti\u00eau chu\u1ea9n an to\u00e0n v\u00e0 ti\u00eau chu\u1ea9n \u0111i\u1ec7n c\u1ee7a t\u1eebng v\u00f9ng. M\u1ed9t v\u00e0i v\u00f9ng s\u1eed d\u1ee5ng c\u1ea3 2 d\u1ea1ng \u0111\u1ea7u v\u00e0o, m\u1ed9t s\u1ed1 v\u00f9ng d\u00f9ng d\u1ea1ng NPN cho ti\u1ebfp \u0111i\u1ec3m c\u01a1 kh\u00ed v\u00e0 c\u00f3 v\u00f9ng l\u1ea1i l\u1ef1a ch\u1ecdn PNP cho \u0111\u1ea7u v\u00e0o c\u1ea3m bi\u1ebfn. B\u1ea1n h\u00e3y ki\u1ec3m tra c\u00e1c ti\u00eau chu\u1ea9n \u0111\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c v\u00f9ng b\u1ea1n \u0111ang sinh s\u1ed1ng ch\u1ee7 y\u1ebfu s\u1eed d\u1ee5ng d\u1ea1ng \u0111\u1ea7u v\u00e0o n\u00e0o.<\/span>
    \n    B\u1ed9 \u0111\u1ebfm H7CX\u00a0<\/a>c\u1ee7a OMRON c\u00f3 th\u1ec3 thay \u0111\u1ed5i d\u1ea1ng \u0111\u1ea7u v\u00e0o b\u1eb1ng\u00a0C\u00f4ng t\u1eafc theo chu\u1ea9n DIP.<\/span>\u00a0<\/strong><\/a><\/p>\n\n\n\n\n\n
    \u0110\u1ea7u v\u00e0o NPN (\u0110\u1ea7u v\u00e0o kh\u00f4ng \u0111i\u1ec7n \u00e1p)<\/strong><\/span><\/td>\n\u0110\u1ea7u v\u00e0o PNP (\u0110\u1ea7u v\u00e0o \u0111i\u1ec7n \u00e1p)<\/strong><\/span><\/td>\n<\/tr>\n
    \"dau<\/a><\/td>\n\"dau<\/td>\n<\/tr>\n
    Kh\u00f4ng c\u1ea7n k\u1ebft\u00a0n\u1ed1i\u00a0b\u1ed9 ngu\u1ed3n ngo\u00e0i<\/span><\/span><\/td>\nC\u1ea7n k\u1ebft n\u1ed1i v\u1edbi b\u1ed9 ngu\u1ed3n ngo\u00e0i\u00a0\u0111\u1ec3 c\u1ea5p ngu\u1ed3n cho m\u1ea1ch \u0111\u1ea7u v\u00e0o<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u0110\u1ea7u ra \u0111i\u1ec1u khi\u1ec3n\u00a0<\/strong><\/span><\/span><\/span><\/span>
    \n\u0110\u1ea7u ra \u0111i\u1ec1u khi\u1ec3n l\u00e0 c\u00e1c t\u00edn hi\u1ec7u b\u1ed9 \u0111\u1ebfm g\u1eedi \u0111i khi gi\u00e1 tr\u1ecb \u0111\u1ebfm hi\u1ec7n t\u1ea1i b\u1eb1ng gi\u00e1 tr\u1ecb \u0111\u1eb7t.
    \nB\u1ed9 \u0111\u1ebfm c\u00f3 hai d\u1ea1ng \u0111\u1ea7u ra: d\u1ea1ng ti\u1ebfp \u0111i\u1ec3m <\/strong> ho\u1eb7c d\u1ea1ng transistor<\/strong>.
    \nVi\u1ec7c l\u1ef1a ch\u1ecdn b\u1ed9 \u0111\u1ebfm theo d\u1ea1ng \u0111\u1ea7u ra n\u00e0o ph\u1ee5 thu\u1ed9c v\u00e0o d\u1ea1ng thi\u1ebft b\u1ecb \u0111\u1ea7u ra v\u00e0 t\u1ea7n s\u1ed1 \u0111\u00f3ng m\u1edf.<\/span><\/p>\n\n\n\n\n\n
    D\u1ea1ng \u0111\u1ea7u ra ti\u1ebfp \u0111i\u1ec3m<\/strong><\/span><\/td>\nD\u1ea1ng \u0111\u1ea7u ra transistor<\/strong><\/span><\/td>\n<\/tr>\n
    \u00a0\"dau<\/a><\/td>\n\"dau<\/td>\n<\/tr>\n
    H7CX-A-N<\/strong><\/a><\/td>\nH7CX-AS-N<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Ph\u01b0\u01a1ng ph\u00e1p reset\u00a0<\/strong><\/span><\/span><\/span><\/span>
    \nReset l\u00e0 thu\u1eadt ng\u1eef m\u00f4 t\u1ea3 vi\u1ec7c l\u00e0m cho “gi\u00e1 tr\u1ecb \u0111\u1ebfm hi\u1ec7n t\u1ea1i” v\u00e0 “\u0111\u1ea7u ra” c\u1ee7a b\u1ed9 \u0111\u1ebfm quay tr\u1edf v\u1ec1 gi\u00e1 tr\u1ecb ban \u0111\u1ea7u tr\u01b0\u1edbc khi b\u1ed9 \u0111\u1ebfm ho\u1ea1t \u0111\u1ed9ng<\/strong>. C\u00f3 4 ph\u01b0\u01a1ng ph\u00e1p reset:<\/span><\/p>\n

      \n
    1. Reset b\u1eb1ng tay<\/strong>
      \nReset b\u1ed9 \u0111\u1ebfm b\u1eb1ng c\u00e1ch \u1ea5n\u00a0<\/strong> n\u00fat reset\u00a0\u1edf m\u1eb7t tr\u01b0\u1edbc b\u1ed9 \u0111\u1ebfm.\"reset\"<\/span><\/li>\n
    2. Reset ngo\u00e0i<\/strong>
      \nReset b\u1ed9 \u0111\u1ebfm b\u1eb1ng c\u00e1ch: t\u1eeb m\u1ed9t thi\u1ebft b\u1ecb \u0111\u1ea7u v\u00e0o b\u00ean ngo\u00e0i g\u1eedi \u0111i m\u1ed9t t\u00edn hi\u1ec7u (t\u00edn hi\u1ec7u t\u1ee9c th\u1eddi ho\u1eb7c duy tr\u00ec) t\u1edbi ch\u00e2n reset c\u1ee7a b\u1ed9 \u0111\u1ebfm.<\/span><\/li>\n
    3. T\u1ef1 \u0111\u1ed9ng reset<\/strong>
      \nB\u1ed9 \u0111\u1ebfm s\u1ebd t\u1ef1 \u0111\u1ed9ng reset khi \u0111\u1ea1t t\u1edbi gi\u00e1 tr\u1ecb \u0111\u1eb7t. (Ch\u00fang ta s\u1ebd \u0111i v\u00e0o chi ti\u1ebft trong c\u00e1c ph\u1ea7n sau c\u1ee7a b\u00e0i h\u1ecdc).<\/span><\/li>\n
    4. Reset b\u1eb1ng c\u00e1ch b\u1eadt ngu\u1ed3n <\/strong>(t\u00f9y lo\u1ea1i Model)
      \nReset b\u1ed9 \u0111\u1ebfm b\u1eb1ng c\u00e1ch l\u1ea7n l\u01b0\u1ee3t t\u1eaft ngu\u1ed3n r\u1ed3i l\u1ea1i b\u1eadt ngu\u1ed3n b\u1ed9 \u0111\u1ebfm. M\u1eb7c d\u00f9 v\u1eady, c\u00e1ch reset n\u00e0y ch\u1ec9 c\u00f3 cho m\u1ed9t s\u1ed1 lo\u1ea1i b\u1ed9 \u0111\u1ebfm (model H7AN v\u00e0 model H7CN).
      \nKi\u1ec3u reset n\u00e0y kh\u00f4ng c\u00f3 \u1edf c\u00e1c b\u1ed9 \u0111\u1ebfm c\u00f3\u00a0ch\u1ee9c n\u0103ng sao l\u01b0u b\u1ed9 nh\u1edb<\/strong>, v\u00ed d\u1ee5 nh\u01b0 model H7CX.<\/span><\/li>\n<\/ol>\n

      Ch\u1ee9c n\u0103ng sao l\u01b0u b\u1ed9 nh\u1edb:\u00a0<\/strong>Ch\u1ee9c n\u0103ng n\u00e0y gi\u00fap b\u1ed9 \u0111\u1ebfm l\u01b0u l\u1ea1i gi\u00e1 tr\u1ecb \u0111\u1ebfm ngay c\u1ea3 khi ngu\u1ed3n \u0111\u00e3 t\u1eaft.\u00a0Khi c\u1ea5p l\u1ea1i ngu\u1ed3n, b\u1ed9 \u0111\u1ebfm s\u1ebd hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb \u0111\u1ebfm t\u1ea1i th\u1eddi \u0111i\u1ec3m t\u1eaft ngu\u1ed3n.<\/span>
      \nT\u1ed1c \u0111\u1ed9 \u0111\u1ebfm c\u1ee7a b\u1ed9 \u0111\u1ebfm<\/strong><\/span><\/span><\/span><\/span>
      \n1. T\u1ed1c \u0111\u1ed9 \u0111\u1ebfm l\u00e0 gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t s\u1ed1 c\u00e1c t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o m\u00e0 b\u1ed9 \u0111\u1ebfm
      \nc\u00f3 th\u1ec3 \u0111\u1ebfm \u0111\u01b0\u1ee3c trong kho\u1ea3ng th\u1eddi gian 1 gi\u00e2y<\/strong>. \u0110\u01a1n v\u1ecb c\u1ee7a t\u1ed1c \u0111\u1ed9 \u0111\u1ebfm l\u00e0 Hz (Hertz).
      \nTrong t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt, t\u1ed1c \u0111\u1ed9 \u0111\u1ebfm \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 t\u1ed1c \u0111\u1ed9 \u0111\u1ebfm l\u1edbn nh\u1ea5t.
      \nV\u00ed d\u1ee5: “T\u1ed1c \u0111\u1ed9 \u0111\u1ebfm l\u1edbn nh\u1ea5t l\u00e0 10 Hz” t\u1ee9c l\u00e0 m\u1ed9t b\u1ed9 \u0111\u1ebfm c\u00f3 th\u1ec3 \u0111\u1ebfm \u0111\u01b0\u1ee3c
      \nt\u1ed1i \u0111a 10 xung trong kho\u1ea3ng th\u1eddi gian 1 gi\u00e2y. N\u00f3i c\u00e1ch kh\u00e1c, m\u1ed9t b\u1ed9 \u0111\u1ebfm 10Hz
      \nc\u00f3 kh\u1ea3 n\u0103ng \u0111\u1ebfm \u0111\u01b0\u1ee3c c\u00e1c xung t\u1eeb 0.1 (1\/10) gi\u00e2y ho\u1eb7c l\u00e2u h\u01a1n.<\/span>
      \n\"toc<\/a>
      \n2. Gi\u00e1 tr\u1ecb c\u1ee7a t\u1ed1c \u0111\u1ed9 \u0111\u1ebfm<\/strong>
      \nTh\u00f4ng th\u01b0\u1eddng, b\u1ea5t k\u1ef3 b\u1ed9 \u0111\u1ebfm n\u00e0o \u0111\u1ec1u c\u00f3 2 t\u1ed1c \u0111\u1ed9 \u0111\u1ebfm: ch\u1eadm v\u00e0 nhanh.
      \nB\u1ea1n c\u00f3 th\u1ec3      \u00a0ch\u1ecdn t\u1ed1c \u0111\u1ed9 \u0111\u1ebfm b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00f4ng t\u1eafc chu\u1ea9n DIP\u00a0<\/strong><\/a>ho\u1eb7c c\u00f4ng t\u1eafc ch\u1ecdn.
      \nH\u00e3y k\u00edch chu\u1ed9t v\u00e0o d\u00f2ng ch\u1eef m\u00e0u xanh \u0111\u1ec3 xem c\u00e1ch s\u1eed d\u1ee5ng c\u00f4ng t\u1eafc DIP cho model H7CX.
      \n<\/span>
      \nT\u1ed1c \u0111\u1ed9 \u0111\u1ebfm nhanh: 1kHz 3kHz 5kHz 10kHz
      \nT\u1ed1c \u0111\u1ed9 \u0111\u1ebfm ch\u1eadm: 10Hz 15Hz 20Hz 30Hz<\/span>
      \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Ghi ch\u00fa:\u00a0 1kHz = 1000 Hz<\/span>
      \nCh\u1ecdn t\u1ed1c \u0111\u1ed9 \u0111\u1ebfm <\/strong><\/span>\u00a0<\/span><\/span><\/span>
      \nCh\u00fang ta ch\u1ecdn t\u1ed1c \u0111\u1ed9 \u0111\u1ebfm d\u1ef1a v\u00e0o lo\u1ea1i thi\u1ebft b\u1ecb \u0111\u1ea7u v\u00e0o v\u00e0 t\u1ea7n s\u1ed1 c\u1ee7a t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o.<\/span><\/p>\n