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。( )
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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