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【单选题】
一个制造商所生产的零件直径的方差本来是0．00156。后来为削减成本，就采用一种费用较低的生产方法。从新方法制造的零件中随机抽取100个作样本，测得零件直径的方差为0．00211。在a—0．05的显著性水平下，检验假设H0：σ2≤0．00156，H1：σ2＞0．00156，得到的结论是( )。A.
拒绝H0
B.
不拒绝H0
C.
可以拒绝也可以不拒绝H0
D.
可能拒绝也可能不拒绝H0
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举一反三
【单选题】What feature of all the advertised properties is likely to be attractive to Ms. White?
A.
The size of backyard
B.
The view of the surrounding area
C.
The number of bedrooms
D.
The location near public transportation
【简答题】A. sou th B. th eatre C. th erefore D. th ink
【单选题】What is the specific feature of fossil fuels?
A.
They are colorless.
B.
They are odorless.
C.
They are rich in carbon.
D.
They are easy to freeze.
【单选题】If you are suffering from insomnia (失眠), you may tune into a channel feature ______.
A.
the sounds of birds
B.
the sound of croaking frogs
C.
folk music from all over the world
D.
a mature male voice slowly counting from one to a thousand.
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