正确答案: A

变大/变小

题目：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（）。

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学习资料的答案和解析：

[单选题]最早用于海船上的蒸汽动力装置是（）。

往复式蒸汽机

[单选题]四冲程柴油机停增压器运转产生的主要问题是（）。

排气倒流

[单选题]A lubricant often has to perform many duties in any situation, in addition to its fundamental job of （）.

reducing friction

[单选题]A variable pitch propeller is made （） a boss with separate blades mounted into it.

up of

[单选题]As for a diesel engine, lack of combustion air may be due to （）.

fouling turbine

[单选题]Due to （） action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

reciprocating

[单选题]The （） or balance tank collects the re-circulated fuel oil.

buffer

[单选题]The rising of the exhaust temperature in manifold pipe may NOT result from （）.

excessive air