正确答案: A

reciprocating

题目：Due to （） action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

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学习资料的答案和解析：

[单选题]MAN-B&W公司推出的带汽轮发电机的废气锅炉系统，主要特点是它带有给水预热器、蒸发器和过热器的单压蒸汽系统；产生的蒸汽除用于加热外还可用于驱动汽轮发电机；废气锅炉与燃油辅助锅炉之间有循环水泵并共用汽鼓。对其评价可选为（）。

排气余热利用较完善，能满足汽轮发电机和加热系统所需蒸汽量

[单选题]In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.

two piston strokes in a two-stroke/cycle engine