A、laying a straight edge across the crank webs at the crankpin and measuring the distance to the crankpin in two places B、measuring the crank drop on either side of each crank throw while the crankshaft is slowly rotated through one revolution C、rotating the crankshaft through one revolution, pausing each 90oof rotation to measure bearing clearances, top and bottom D、taking micrometer reading between the crank cheeks opposite the crankpin every 90°of crank angle rotation

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第7题

[单选题] Just after stopping the engine while the oil is still circulating.Check that uniform oil jets appear from all the oil outlet grooves in the crosshead bearing lower shell and the guide shoes.The oil flow from （） must be compared from unit; there should be a similarity in the flow patterns.

A、the piston cooling oil return pipes B、the main and crankpin bearings C、thrust and intermediate bearings D、stern tube and thrust bearings

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第8题

[] The （） of the semi-built method of the construction crankshaft is that by making the two webs and crankpin from a single forging the grain flow in the steel follows the web round into the crankpin and back down the other web.

A、A.advantages B、B.disadvantages C、C.power advantages D、D.power disadvantages

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第9题

[填空题] 关于外告警线的连接，普天电源外部告警设置中的“AC ABNORMAL”告警线是对应监控告警输出板（）和（）两个端子。

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