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【单选题】
_____ readers said they were going to learn a new language. [ ]A.
A little
B.
Little
C.
Few
D.
A few
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【单选题】某工程混凝土试验室配合比为:1:2.2:4.26,w/c=0.6,每立方米混凝土中水泥用量为300kg,现场实测砂的含水率为3%,石的含水率为1%,现采用250L搅拌机进行搅拌。每搅拌一次水泥的用量为( )kg。
A.
300
B.
200
C.
195
D.
75
【单选题】Regarding null hypothesis and alternative hypothesis , which one is wrong ( ).
A.
generally，a null hypothesis state that there’s no difference between the two populations.
B.
null hypothesis and alternative hypothesis are mutually exclusive, and only one can be true.
C.
the alternative hypothesis is effectively the opposite of a null hypothesis
D.
the two hypotheses are certain hypotheses for the sample
E.
the two hypotheses are certain hypotheses for the population
【简答题】试辨认分类编址方式中以下 IP 地址的网络类别
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