Khi \u0111i mua h\u00e0ng ng\u01b0\u1eddi ta hy v\u1ecdng mua \u0111\u01b0\u1ee3c h\u00e0ng ho\u00e1 ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t n\u00ean khi ch\u1ecdn h\u00e0ng, n\u00f3i chung h\u1ecd ph\u1ea3i \u0111\u1ecdc k\u0129 gi\u1ea5y ch\u1ee9ng nh\u1eadn ch\u1ea5t l\u01b0\u1ee3ng h\u00e0ng ho\u00e1. V\u1ec1 m\u1eb7t c\u1eeda h\u00e0ng, nh\u1eb1m gi\u1eef g\u00ecn uy t\u00edn c\u1ee7a kh\u00e1ch h\u00e0ng v\u1edbi c\u1eeda h\u00e0ng, tr\u01b0\u1edbc khi nh\u1eadp h\u00e0ng ch\u1ee7 c\u1eeda hi\u1ec7u c\u0169ng ph\u1ea3i ki\u1ec3m tra c\u1ea9n th\u1eadn ch\u1ea5t l\u01b0\u1ee3ng h\u00e0ng ho\u00e1 nh\u1eadp. L\u00e0m th\u1ebf n\u00e0o m\u00e0 c\u1eeda h\u00e0ng c\u00f3 th\u1ec3 n\u1eafm ch\u1eafc \u0111\u01b0\u1ee3c ch\u1ea5t l\u01b0\u1ee3ng h\u00e0ng ho\u00e1 nh\u1eadp?<\/p>\n\n\n\n
Tr\u00ean th\u1ef1c t\u1ebf, tr\u01b0\u1edbc khi c\u1eeda hi\u1ec7u nh\u1eadp h\u00e0ng h\u1ecd c\u0169ng ph\u1ea3i \u0111\u1ecdc k\u0129 c\u00e1c ch\u1ee9ng ch\u1ec9 ch\u1ea5t l\u01b0\u1ee3ng th\u01b0\u01a1ng ph\u1ea9m, \u0111\u1ed3ng th\u1eddi ph\u1ea3i ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng th\u1ef1c c\u1ee7a th\u01b0\u01a1ng ph\u1ea9m. Ch\u00fang t\u00f4i xin n\u00eau ra m\u1ed9t v\u00ed d\u1ee5 \u0111\u1ec3 thuy\u1ebft minh c\u1eeda hi\u1ec7u ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng h\u00e0ng ho\u00e1 b\u1eb1ng c\u00e1ch n\u00e0o?<\/p>\n\n\n\n
Gi\u1ea3 s\u1eed c\u1eeda h\u00e0ng nh\u1eadn ti\u00eau th\u1ee5 s\u1ea3n ph\u1ea9m b\u00f3ng \u0111\u00e8n cho m\u1ed9t nh\u00e0 m\u00e1y n\u00e0o \u0111\u00f3. Nh\u00e0 m\u00e1y cung c\u1ea5p ch\u1ee9ng ch\u1ec9 ch\u1ea5t l\u01b0\u1ee3ng ghi tu\u1ed5i th\u1ecd b\u00f3ng \u0111\u00e8n kh\u00f4ng \u00edt h\u01a1n 2000 gi\u1edd cho ph\u00e9p sai 200 gi\u1edd. Ch\u1ee7 hi\u1ec7u mu\u1ed1n bi\u1ebft th\u1ef1c s\u1ef1 b\u00f3ng \u0111\u00e8n c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi ch\u1ee9ng ch\u1ec9 ch\u1ea5t l\u01b0\u1ee3ng hay kh\u00f4ng, li\u1ec1n ch\u1ecdn l\u1ea5y 10 b\u00f3ng \u0111\u00e8n \u0111\u1ec3 ki\u1ec3m tra. Vi\u1ec7c \u0111o tu\u1ed5i th\u1ecd c\u1ee7a b\u00f3ng \u0111\u00e8n \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n tr\u00ean b\u1ea3ng s\u1ed1 li\u1ec7u sau (\u0111\u01a1n v\u1ecb: gi\u1edd). 2250, 1580, 1790, 3020, 1850, 2360, 1430, 2050, 1960, 1690.<\/p>\n\n\n\n
T\u00ednh ra tu\u1ed5i th\u1ecd trung b\u00ecnh c\u1ee7a 10 b\u00f3ng \u0111\u00e8n l\u00e0 1998 gi\u1edd nh\u1ecf h\u01a1n 2000 gi\u1edd. Li\u1ec7u c\u00f3 ph\u1ea3i tu\u1ed5i th\u1ecd b\u00f3ng \u0111\u00e8n kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi ch\u1ee9ng ch\u1ec9 ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a nh\u00e0 m\u00e1y kh\u00f4ng? V\u00e0 c\u1eeda h\u00e0ng kh\u00f4ng n\u00ean nh\u1eadn l\u00f4 h\u00e0ng n\u00e0y kh\u00f4ng?<\/p>\n\n\n\n
Kh\u00f4ng ph\u1ea3i v\u1eady, gi\u1ea5y ch\u1ee9ng ch\u1ec9 ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a nh\u00e0 m\u00e1y l\u00e0 ch\u1ec9 tu\u1ed5i th\u1ecd trung b\u00ecnh c\u1ee7a b\u00f3ng \u0111\u00e8n kh\u00f4ng \u00edt h\u01a1n 2000 gi\u1edd l\u00e0 cho to\u00e0n l\u00f4 b\u00f3ng \u0111\u00e8n c\u1ee7a nh\u00e0 m\u00e1y. Khi ti\u1ebfn h\u00e0nh ki\u1ec3m tra ch\u1ec9 l\u1ea5y 10 b\u00f3ng \u0111\u00e8n \u0111\u1ec3 ki\u1ec3m tra, c\u00e1c k\u1ebft qu\u1ea3 ki\u1ec3m tra t\u1ea5t nhi\u00ean c\u00f3 t\u00ednh ng\u1eabu nhi\u00ean v\u00e0 kh\u00f4ng ho\u00e0n to\u00e0n \u0111\u1ea1i di\u1ec7n cho b\u00f3ng \u0111\u00e8n c\u1ee7a nh\u00e0 m\u00e1y. Gi\u1ea3 s\u1eed n\u1ebfu s\u1ef1 th\u1ef1c b\u00f3ng \u0111\u00e8n c\u1ee7a nh\u00e0 m\u00e1y c\u00f3 th\u1ec3 l\u1edbn h\u01a1n 2000 gi\u1edd. N\u1ebfu nh\u01b0 ch\u1ee7 c\u1eeda h\u00e0ng v\u00ec tu\u1ed5i th\u1ecd trung b\u00ecnh c\u1ee7a 10 b\u00f3ng \u0111\u00e8n nh\u1ecf h\u01a1n 2000 gi\u1edd m\u00e0 kh\u00f4ng nh\u1eadp h\u00e0ng th\u00ec c\u00f3 th\u1ec3 s\u1ebd m\u1eafc ph\u1ea3i sai l\u1ea7m. V\u00ec tu\u1ed5i th\u1ecd c\u1ee7a b\u00f3ng \u0111\u00e8n l\u00e0 kh\u00f4ng gi\u1ed1ng nhau, khi ki\u1ec3m tra h\u00e0ng m\u1eabu c\u0169ng mang t\u00ednh ng\u1eabu nhi\u00ean, v\u00ec th\u1ebf kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi sai s\u00f3t. C\u1ea3 hai ph\u00eda nh\u00e0 m\u00e1y v\u00e0 c\u1eeda hi\u1ec7u \u0111\u1ec1u mong mu\u1ed1n kh\u1ea3 n\u0103ng ph\u1ea1m ph\u1ea3i sai l\u1ea7m lo\u1ea1i n\u00e0y l\u00e0 nh\u1ecf nh\u1ea5t, v\u00e0 kh\u1ed1ng ch\u1ebf lo\u1ea1i sai l\u1ea7m n\u00e0y kh\u00f4ng qu\u00e1 10%. Mu\u1ed1n l\u00e0m \u0111\u01b0\u1ee3c vi\u1ec7c \u0111\u00f3 ph\u1ea3i d\u00f9ng ph\u01b0\u01a1ng ph\u00e1p th\u1ed1ng k\u00ea.<\/p>\n\n\n\n
Theo c\u00e1c kinh nghi\u1ec7m trong qu\u00e1 kh\u1ee9, \u0111\u1ea1i \u0111a s\u1ed1 l\u00f4 b\u00f3ng \u0111\u00e8n c\u00f3 tu\u1ed5i th\u1ecd ti\u1ebfp c\u1eadn v\u1edbi tu\u1ed5i th\u1ecd trung b\u00ecnh, c\u00e1c b\u00f3ng \u0111\u00e8n c\u00f3 tu\u1ed5i th\u1ecd kh\u00e1c v\u1edbi tu\u1ed5i th\u1ecd trung b\u00ecnh l\u00e0 r\u1ea5t \u00edt. Theo ng\u00f4n ng\u1eef th\u1ed1ng k\u00ea tu\u1ed5i th\u1ecd c\u1ee7a b\u00f3ng \u0111\u00e8n tu\u00e2n theo lu\u1eadt ph\u00e2n b\u1ed1 chu\u1ea9n. V\u00ec v\u1eady n\u1ebfu \u0111\u1ee9ng v\u1ec1 ph\u00eda nh\u00e0 m\u00e1y th\u00ec vi\u1ec7c l\u1ea5y 10 b\u00f3ng \u0111\u00e8n \u0111\u1ec3 ki\u1ec3m tra, tu\u1ed5i th\u1ecd trung b\u00ecnh c\u1ee7a ch\u00fang ph\u1ea3i ti\u1ebfp c\u1eadn tu\u1ed5i th\u1ecd trung b\u00ecnh l\u00e0 2000 gi\u1edd. Theo k\u1ebft qu\u1ea3 t\u00ednh to\u00e1n, tu\u1ed5i th\u1ecd trung b\u00ecnh c\u1ee7a c\u00e1c b\u00f3ng \u0111\u00e8n nh\u1ecf h\u01a1n 1919 gi\u1edd c\u00f3 kh\u1ea3 n\u0103ng kh\u00f4ng qu\u00e1 10%. N\u1ebfu k\u1ebft qu\u1ea3 ki\u1ec3m tra nh\u1ecf h\u01a1n 1919 gi\u1edd, c\u1eeda hi\u1ec7u s\u1ebd \u0111\u00e1nh gi\u00e1 l\u00e0 l\u00f4 h\u00e0ng kh\u00f4ng \u0111\u1ee7 ti\u00eau chu\u1ea9n v\u00e0 kh\u00f4ng nh\u1eadn l\u00f4 h\u00e0ng. Khi \u0111\u00f3 sai l\u1ea7m lo\u1ea1i b\u1ecf s\u1ef1 th\u1eadt b\u1ea3o \u0111\u1ea3m kh\u00f4ng qu\u00e1 10%. Hi\u1ec7n t\u1ea1i k\u1ebft qu\u1ea3 ki\u1ec3m tra cho th\u1ea5y tu\u1ed5i th\u1ecd trung b\u00ecnh c\u1ee7a b\u00f3ng \u0111\u00e8n l\u00e0 1998 gi\u1edd v\u00ec v\u1eady c\u1eeda h\u00e0ng s\u1ebd kh\u00f4ng c\u1ef1 tuy\u1ec7t vi\u1ec7c nh\u1eadn l\u00f4 h\u00e0ng.<\/p>\n\n\n\n
\u0110\u01b0\u01a1ng nhi\u00ean ngo\u00e0i nguy c\u01a1 lo\u1ea1i b\u1ecf c\u00e1i t\u1ed1t c\u00f2n \u0111\u1ec1 ph\u00f2ng vi\u1ec7c nh\u1eadn nh\u1ea7m c\u00e1i x\u1ea5u. Vi\u1ec7c nh\u1eadn nh\u1ea7m l\u00e0 ch\u1ec9 vi\u1ec7c nh\u1eadn nh\u1ea7m ph\u1ea3i s\u1ea3n ph\u1ea9m k\u00e9m ch\u1ea5t l\u01b0\u1ee3ng, nh\u1eadn s\u1ea3n ph\u1ea9m kh\u00f4ng h\u1ee3p c\u00e1ch do k\u1ebft qu\u1ea3 ki\u1ec3m tra nh\u1ea7m, s\u1ea3n ph\u1ea9m x\u1ea5u l\u1ea1i tr\u1edf th\u00e0nh t\u1ed1t. Trong ki\u1ec3m tra s\u1ea3n ph\u1ea9m c\u0169ng kh\u00f4ng lo\u1ea1i b\u1ecf \u0111\u01b0\u1ee3c ho\u00e0n to\u00e0n sai l\u1ea7m ki\u1ec3m tra nh\u1ea7m m\u00e0 ch\u1ec9 c\u00f3 th\u1ec3 kh\u1ed1ng ch\u1ebf \u0111\u1ec3 sai l\u1ea7m c\u00f3 th\u1ec3 b\u1ecb h\u1ea1n ch\u1ebf trong m\u1ed9t gi\u1edbi h\u1ea1n n\u00e0o \u0111\u00f3.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: \u0110\u1ed9 l\u1ec7ch chu\u1ea9n; Lo\u1ea1i b\u1ecf c\u00e1i th\u1eadt; Nh\u1eadn nh\u1ea7m.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Khi \u0111i mua h\u00e0ng ng\u01b0\u1eddi ta hy v\u1ecdng mua \u0111\u01b0\u1ee3c h\u00e0ng ho\u00e1 ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t n\u00ean khi ch\u1ecdn h\u00e0ng, n\u00f3i chung h\u1ecd ph\u1ea3i \u0111\u1ecdc k\u0129 gi\u1ea5y ch\u1ee9ng nh\u1eadn ch\u1ea5t l\u01b0\u1ee3ng h\u00e0ng ho\u00e1. V\u1ec1 m\u1eb7t c\u1eeda h\u00e0ng, nh\u1eb1m gi\u1eef g\u00ecn uy t\u00edn c\u1ee7a kh\u00e1ch h\u00e0ng v\u1edbi c\u1eeda h\u00e0ng, tr\u01b0\u1edbc khi nh\u1eadp h\u00e0ng ch\u1ee7 c\u1eeda hi\u1ec7u c\u0169ng […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,9],"tags":[],"class_list":["post-7621","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-toan-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7621","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=7621"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7621\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7621"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7621"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}