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【单选题】
在某些液压系统中安装了一个活门,它在系统正常工作时保持打开,如果一次通过的油液总量达到一定值它就会自动关断,这个活门称为:A.
自动转换活门。
B.
量器。
C.
定量器。
D.
优先活门。
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