Due to （） action of pistons some relative motion between p

【名词&注释】

过热器(superheater)、蒸发器(evaporator)、给水预热器(feed unit water preheater)

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

A. reciprocating
B. rotating
C. running
D. removing

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学习资料：

[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（）。

A. 该废气锅炉系统布置合理，但满足汽轮发电机所需蒸汽量时，不能满足加热之需
B. 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
C. 该废气锅炉系统更先进，不仅满足加热系统的要求，还部分满足汽轮发电机之需
D. 该废气锅炉系统适宜于各类功率大小的船舶

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

A. two crankshaft revolutions in a two-stroke/cycle engine
B. two power strokes in a two-stroke/cycle engine
C. one power stroke in a two-stroke/cycle engine
D. two piston strokes in a two-stroke/cycle engine

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