正确答案: C

crankcase

题目：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.

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学习资料的答案和解析：

[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。

12

[单选题]吊缸主机检修时，应当（），以防止伤人和损坏机件。

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.

being rounded

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

a worn cylinder

[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.

will lift

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

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（）.

gas turbine