正确答案: D

the crankcase door

题目：For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.

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学习资料的答案和解析：

[单选题]增压器校中测量是通过测量（）间隙进行对中情况的精确检验。

M、L

[单选题]Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.

the highest point

[单选题]Before starting the turning gear, （） should be worked by hand to minimize corrosive action on the liners.

the cylinder lubricators

[单选题]Compressed air is used on board ship （）.

All the above are true

[单选题]In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.

the bowl periphery

[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]The operation between two fuel injections is called a working cycle, which consists of a fixed sequence of eventsWhat does "which" mean in this sentence?（）

a working cycle

[单选题]To avoid scavenge fires occurring the engine timing and equipment maintenance （）.

should be correctly carried out

[单选题]All diesel engines are classified as（）.

compression ignition