正确答案: B

changing the speed of the driving rotor

题目：The amount of fluid delivered by a positive displacement pump can be regulated by _____.

解析：B

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学习资料的答案和解析：

[单选题]先导型溢流阀主阀阻尼孔堵塞可能使所控制油路( )。

油压太低

[单选题]除非另有规定，货物处所有可用的CO2量应足以放出体积至少等于该船最大的装货处所总容积的______自由气体。

30％

[单选题]Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?

Blocked cooling water passages to the head

[单选题]开花直流两用水枪不适宜于：

灭过道烟火时，最好从两头同时进攻灭火。