柴油机吊缸时，不正确的做法是（）。

【名词&注释】

柴油机(diesel engine)、燃烧室(combustion chamber)、调速器(governor)、仔细观察(careful observation)、十字头销(crosshead pin)

[单选题]柴油机吊缸时，不正确的做法是（）。

A. 起吊活塞组件之前应将缸套的磨台修磨光顺
B. 在拆卸下来的零件配合面上做好记号
C. 活塞组件吊出后应仔细观察燃烧室零件的表面状态
D. 活塞组件吊出后应用木板将气缸孔口盖住

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学习资料：

[单选题]换新十字头轴瓦时，十字头销^{(crosshead pin)}与轴承下瓦在（）内的接触面积不少于（）。

A. 40°～60°/75%
B. 40°～60°/85%
C. 60°～90°/75%
D. 60°～90°/85%

[单选题]（） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.

A. Bulbs
B. Bulks
C. Flyweights
D. Flywheel

[单选题]Factor influencing the position of the interface between the liquid seal and the oil in a purifier is （）.

A. throughput
B. back pressure
C. gravity disc
D. None of the above is wrong

[单选题]In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.

A. additives
B. water
C. grease
D. acid solutio

[单选题]Those generally used additives for cooling water are either anti-corrosion oils or inorganic（）.

A. gases
B. paints
C. inhibitors
D. detergent

[单选题]The main function of tie rods in the construction of large, low speed diesel engines is to（）.

A. stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength
B. accept most of the tensile loading that results from the firing forces developed during operation
C. mount the engine frame securely to the hull to prevent shaft coupling misalignment
D. connect the crosshead solidly to the piston rod

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