柴油机未装连杆状态下，盘车一周可测得曲轴（）个臂距值。

【名词&注释】

柴油机(diesel engine)、机动性(mobility)

[单选题]柴油机未装连杆状态下，盘车一周可测得曲轴（）个臂距值。

A. 3
B. 4
C. 5
D. 6

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学习资料：

[单选题]发动机连续起动次数越多其机动性越好，对每台可换向的主机在冷机条件下应不少于（）次。

A. 3
B. 6
C. 12
D. 15

[单选题]若已知曲轴的轴线状态呈拱腰形，则其两主轴承高度必然（）于相邻轴承，测得臂距差为（）值。

A. 低/正
B. 低/负
C. 高/正
D. 高/负

[单选题]For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.

A. a gravity tank
B. a sump
C. a vessel
D. a bottle

[单选题]Main bearings are required to support the crankshaft at each （）.

A. end
B. web
C. pin
D. journal

[单选题]The bore of each cylinder is formed in a liner which can be （） when worn out.

A. welded
B. replaced
C. drilled again
D. bored

[单选题]The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.

A. crack
B. knocking
C. leaking
D. seizure

[单选题]With （）, the corrosion problems are much reduced in a central cooling system.

A. no equipment in contact with sea water
B. less equipment in contact with fresh water
C. more equipment in contact with sea water
D. less equipment in contact with sea water

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