海船船员考试题库2022船舶动力装置题库考试试题(7J)

1. [单选题]偏移值和曲折值的统称是（）。

A. 偏差度
B. 同轴度
C. 偏心值
D. 偏中值

2. [单选题]A-frames are mounted on the bed plate and support （） and cylinder block.

A. the main bearing
B. the cylinder cover
C. the entablature
D. the sum

3. [单选题]The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.

A. assist in a quick cutoff of fuel injection
B. allow oil backflow from the injector to the helix
C. reduce fuel oil pressure between injection strokes
D. meter the quantity of fuel delivered

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