题目内容

压力继电器控制的顺序动作回路,其压力调定值应比先动缸的最低工作压力高,同时又应比溢流阀调定值压力高。( )

A. 对
B. 错

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液压系统中只要有顺序阀,一定有顺序动作回路。( )

A. 对
B. 错

集总参数电路代替实际电路的条件是?

A. l《λ
B. l≥λ
C. l=λ
D. l与λ无关

The man __________ for his frankness will make a speech at the meeting.

A. knowing
B. known
C. beingknown
D. having known

There was nothing to prevent her from _______ so.

A. to do
B. doing
C. done
D. being done

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