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【多选题】
关于气缸式传动装置,下面的选项哪个说法是正确的(多选)。A.
活塞上涂有机油,以减少摩擦力并具有良好的密封性能。
B.
该种传动方式的优点是工作行程可以选择,以满足开距和超程的要求
C.
该传动摩擦力较大,动作较慢。
D.
该传动装置具有动作灵活、摩擦力和磨损较小、维修方便等特点
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【简答题】Why did unemployment increase during the period discussed in the passage? [A] There are fewer jobs in summer. [B] Many companies had dismissed workers. [C] The labor force had grown. [D] Records have ...
【单选题】Why TI' practitioners are reluctant to accept independent testing?
A.
'They will not get financial benefits from the test.
B.
The reliability to the test is highly doubted.
C.
They believe the test is not in line with their practice.
D.
They do not want to disclose the truth to the public.
【单选题】According to paragraph 1, why is it impossible to identify the time period for theatres in Greece?
A.
There are too few sites that have been excavated and very little data collected about them.
B.
The archeologists from earlier periods were not careful, and many artifacts were broken.
C.
It is confusing because stones from early sites were used to build later structures.
D.
Because it is very difficult to date the concrete that was used in construction during early periods.
【单选题】Why did some TI' practitioners agree to be the subjects of Emily's experiment ?
A.
It involved nothing more than mere guessing.
B.
They thought it was going to be a lot of fun.
C.
It was more straightforward than other experiments.
D.
They sensed no harm in a little girl's experiment.
【单选题】Why did unemployment increase during the period discussed in the passage?
A.
There are fewer jobs in summer.
B.
Many companies had dismissed workers.
C.
The labor force had grown.
D.
Records have become more accurate (准确).
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