Dual electro-hydraulic steering units usually operate ().
A. with both pumps on line at the same time
B. with one pump on standby
C. with the follow-up gear disconnected
D. only when the rudder is moved amidshi
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离心水泵启动后,只出一股水就没有了,产生这种现象的原因是什么?
注册资产评估师可以同时在多个资产评估机构执业。
A. 正确
B. 错误