当液压系统中某一分支油压低于其它工作部件的油压时,若共用一个液压泵供油必须采用()。
A.减压阀
B.顺序阀
C.溢流阀
D.先导式溢流阀
参考答案:A
悬吊绝缘子距电机车架空线的距离,每侧不得大于()。
A.0.3m
B.0.2m
C.0.15m
D.0.25m
While it is essential that the text covers the subject adequately, it is also important that it is neither too detailed or too complex for the intended reader.
A.for
B.nor
C.no
D.not