泵控型舵机工作时主泵在舵转到指令舵角后（）。
A．始终全流量运转
B．即空转不排油
C．低压小流量排油
D．即停止转动
参考答案：B
() before you leave the lab.
A．Make sure that the windows are shut
B．To make sure that the windows are shut
C．Making sure to shut the windows
D．To be sure to shut the windows
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