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【单选题】
学生A说：在齿轮传动中，斜齿轮比正齿轮啮合更为平稳，噪声更小；学生B说：在拆装发动机的时候，配气机构的拆装要观察原机体上有没有正时记号，没有的话要认真做好记号，备装配的时候用。下列说法正确的是（）。A.
只有学生A正确
B.
只有学生B正确
C.
学生A和B都正确
D.
学生A和B都错误
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举一反三
【单选题】People were given physical fitness tests in order to find out ______.
A.
how well they could do in athletics
B.
what their health condition was like
C.
what kind of fitness center was suitable for them
D.
whether they were fit for aerobic exercise
【多选题】对预加轴向压力的钢支撑,施加预压力时应符合下列要求( )。
A.
对支撑施加压力的千斤顶应有可靠、准确的计量装置。
B.
千斤顶的压力应分级施加,施加每级压力后应保持压力稳定 5 分钟后方可施加下一级压力。
C.
支撑施加压力过程中,当出现焊点开裂、局部压曲等异常情况时应卸除压力,在对支撑的薄弱处进行加固后,方可继续施加压力。
D.
千斤顶压力的合力点应与支撑轴线重合,千斤顶应在支撑轴线两侧对称、等距放置,且应同步施加压力。
E.
当监测的支撑压力出现损失时,应再次施加预压力。
【单选题】In order to find out how the famous painting was stolen as soon as possible, more experienced policemen have been sent to _____ the case.
A.
look for
B.
look up
C.
look into
D.
look through
【单选题】In order to find how accurate the data is, the following points must be considered: -
A.
Specification and methodology used;
B.
Margin of error should be examined;
C.
The dependability of the source must be seen.
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