（） at the end of the distribution pipe ensures that adequa

【名词&注释】

回油阀调节式喷油泵

[单选题]（） at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.

A. A relief valve
B. An alarm
C. A pressure gauge
D. A non-maim valve

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学习资料：

[单选题]在检查和调整主机回油阀调节式喷油泵的供油量均匀性时，对始终点调节式喷油泵，可通过转动进回油阀阀杆下的调节螺钉改变顶杆长度，从而调节柱塞的有效行程。当进油阀的顶杆伸长时，柱塞的有效行程（），回油阀的顶杆伸长时，柱塞的有效行程（）。

A. 变大/变小
B. 变大/变大
C. 变小/变大
D. 变小/变小

[单选题]艉轴裂纹主要发生在（）等处。Ⅰ.法兰根部；Ⅱ.工作轴颈；Ⅲ.铜套接缝处轴颈；Ⅳ.键槽根部；Ⅴ.锥部大端截面变化。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ

[单选题]Fuel oil is pumped by means of （） from the bunker tanks.

A. a transfer pump
B. a bilge pump
C. a service pump
D. a vacuum pum

[单选题]What preventative maintenance should be done frequently to diesel engine starting air receivers?（）

A. Drain the accumulated moisture
B. Test the relief valves
C. Watch the temperature to prevent fluctuations in pressure
D. Clean the interior to remove oil and foreign matter

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