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【单选题】
是液压系统的执行元件A.
电动机
B.
液压缸
C.
液压泵
D.
液压控制阀
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举一反三
【单选题】The passage suggests that the early shops for making tools were______.
A.
not very sophisticated.
B.
known for doing very quick work.
C.
dependent on imported materials.
D.
frequented only by fashionable people.
【单选题】What tools were used to dig holes to lay the wooden stumps?
A.
Cow jaw-bones.
B.
Sharp rocks
C.
Aliens
D.
Deer antlers
【简答题】A．The clay was placed in molds. B．Special tools were used to shape the clay. C．Each person was responsible for a particular part of the process. D．It was created on pottery wheels.
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