Lubricating oil for an engine is stored at the bottom of the

【名词&注释】

发动机、机动性(mobility)、警告牌(warning board)

[单选题]Lubricating oil for an engine is stored at the bottom of the （）, known as the sump or in a drain tank located beneath the engine.

A. sea cheat
B. air receiver
C. crankcase
D. water box

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[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]吊缸主机检修时，应当（），以防止伤人和损坏机件。

A. 合上盘车机
B. 脱开盘车机
C. 在主机操纵部位悬挂警告牌
D. 合上盘车机并在主机操纵部位悬挂警告牌

[单选题]All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.

A. angled
B. rounded
C. being angled
D. being rounded

[单选题]Low compression of diesel engine may result from （）

A. a worn cylinder
B. broken piston rings
C. any of A and B
D. none of the above

[单选题]The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.

A. will lift
B. will be lifted
C. will close
D. will be closed

[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

[单选题]Among the main propulsion units on board the ship with the same capacity, the lightest one is（）.

A. steam engine
B. steam turbine
C. gas turbine
D. diesel engine

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