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【单选题】
气动控制元件的作用是( ) 。A.
将压缩空气的机械能转换成压力能的装置
B.
用来控制压缩空气的压力、流量、方向及执行元件工作程序的元件
C.
产生、处理和储存压缩空气的装置
D.
将压缩空气的压力能转换成机械能的装置
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反馈参考答案：
举一反三
【单选题】Human mind can respond quickly to what is before it, and by the same token can call up from within a host of appropriate ideas.
A.
as a similar symbol
B.
for the same reason
C.
at the same time
D.
by the same means
【单选题】Table tennis is easy to learn, and, by the same token, boys don't need a lot of space to practice it.
A.
by the same rule
B.
symbolically
C.
moreover
D.
by logic
【单选题】We must the right place to park the car.
A.
look at
B.
look up
C.
look after
D.
look for
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