The amount of fluid delivered by a positive displacement pum

【名词&注释】

易燃品(inflammable substance)、先导型溢流阀

[单选题]The amount of fluid delivered by a positive displacement pump can be regulated by _____.

A. throttling the pressure line
B. changing the speed of the driving rotor
C. either A or B
D. None of the above is tree

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学习资料：

[单选题]先导型溢流阀主阀阻尼孔堵塞可能使所控制油路( )。

A. 油压太高
B. 油压太低
C. 油压波动
D. 出现噪声

[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。

A. 30％
B. 35％
C. 40％
D. 50％

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

A. Leaking seal ring
B. Insufficient heat transfer from the exhaust valves
C. Blocked cooling water passages to the head
D. Excessive scavenging air provided to the engine

[单选题]开花直流两用水枪不适宜于：

A. 对火场周围铁板等设备降温、冷却，防止火势蔓延。
B. 保护人员接近火场灭火。
C. 对燃烧物有冷却、摧毁作用，使易燃品与火源隔开。
D. 灭过道烟火时，最好从两头同时进攻灭火。

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