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【单选题】
每次仅随机抽取一个单位产品进行检验,检验后即按判定规则作出合格、不合格或再抽若干单位产品的判断,一旦能作出该批合格或不合格的判定时,就终止检验。这种检验方法称为( )。A.
一次抽检方法
B.
二次抽检方法
C.
多次抽检方法
D.
序贯抽检方法
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【单选题】Little _____ about A-H1N1 so far, so there is no doubt that many people are afraid when talking about the disease. [ ]
A.
did scientists know
B.
scientists have known
C.
have scientists known
D.
had scientists known
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【单选题】Where Have All the Bees Gone? ?? Scientists who study insectshave a real mystery on their hands. All across the country, honeybees areleaving their hives and never returning. Researchers call this phe...
A.
Honeybees are flying all across the country
B.
25-40 percent of the honeybees in the US have died
C.
Honeybees are leaving their hives and do not return
D.
Honeybee hives are in disorder
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