吊缸检查气缸盖的气阀时，主要检查（）的损伤情况。

【名词&注释】

利用率(utilization ratio)、饱和度(saturation)

[单选题]吊缸检查气缸盖的气阀时，主要检查（）的损伤情况。

A. 阀面和阀盘
B. 阀面和阀座
C. 阀杆和气动活塞（或弹簧）
D. 阀面和气动活塞或弹簧

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学习资料：

[单选题]机舱饱和度是表征机舱利用率的指标，由（）来表示。

A. 长度饱和度
B. 面积饱和度
C. 容积饱和度
D. B+C

[单选题]船轴工作轴颈磨损后，经测量表明（）超标准时应予以修复。Ⅰ.圆度；Ⅱ.圆柱度；Ⅲ.椭圆度；Ⅳ.法兰径向跳动；Ⅴ.法兰端面跳动。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅰ＋Ⅱ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ

[单选题]In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.

A. pressure charged
B. naturally aspirated
C. contaminated
D. high speed diesel

[单选题]Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）

A. Increased suction head pressure
B. Decreased feedwater temperature
C. Pump recirculating line being open too much
D. Excessive feedwater temperature

[单选题]Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）

A. Impurities
B. Lube oil
C. Gasoline
D. Diesel fuel

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