All the rings are slightly rounded on their external top and

【名词&注释】

可靠性(reliability)、环境温度(ambient temperature)

[单选题]All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.

A. the running-in period
B. the running process
C. gas exchange process
D. the boiler firing

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学习资料：

[单选题]可靠性定义中所述及的“规定的条件”，包括（）。Ⅰ.环境温度、压力、湿度；Ⅱ.振动；Ⅲ.承受的负荷

A. Ⅰ+Ⅱ
B. Ⅱ+Ⅲ
C. Ⅰ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]（） usually helps to induce air movement to assist combustion.

A. Cylinder cover
B. Main bearing
C. The exhaust valve
D. The piston movement

[单选题]A level gauge for a tank is to （）.

A. give the pressure
B. give the contents
C. give the shape of the tank
D. give the accuracy level

[单选题]The governor of a generator engine is to （）.

A. make the engine stop
B. regulate the timing of camshafts
C. make the rpm stabilize at any required value
D. make the engine run at nearly constant speed

[单选题]Valve overlap is the period during which （）.

A. the inlet valve is open
B. the exhaust valve is open
C. both valves are closed
D. both valves are ope

[单选题]In using reduction gears to obtain efficient propeller speeds, （）.

A. they must be located at the after end of the engine
B. they can only be used with one engine at a time
C. they eliminate the need for controllable pitch propellers
D. they are connected to the engine with a flexible coupling

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