For an ordinary four-stroke diesel engine the exhaust valves

【名词&注释】

液压油(hydraulic oil)、柴油机气缸套(engine cylinder liner)、用柴油机、系统润滑油、高级润滑油(high class lubricating oils)

[单选题]For an ordinary four-stroke diesel engine the exhaust valves close （）.

A. after TDC
B. before TDC
C. after BDC
D. before BDC

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学习资料：

[单选题]已知6300ZC型船用柴油机气缸套最大内径增量为1.2mm，则最大缸径为（）。

A. 631.2mm
B. 301.2mm
C. 298.8mm
D. 31.2mm

[单选题]液压拉伸器的液压系统中的液压油绝对不可使用（）。Ⅰ.液压油；Ⅱ.系统润滑油；Ⅲ.高级润滑油^{(high class lubricating oils)}；Ⅳ.气缸油；Ⅴ.透平油。

A. Ⅳ＋Ⅴ
B. Ⅱ＋Ⅲ
C. Ⅱ＋Ⅳ
D. Ⅰ＋Ⅳ

[单选题]Dirt in the fuel oil system of a diesel engine can cause （）.

A. clogged filters
B. poor combustion
C. overloading of the diesel
D. shock of fuel line

[单选题]The cooling water is in direct contact with the outer surface of the liner as a result of which it is termed a （）.

A. water liner
B. wet liner
C. dry liner
D. drown liner

[单选题]In the combustion chamber, the part whose surface is exposed to the highest temperature is the （）.

A. cylinder liner
B. cylinder cover
C. piston
D. exhaust valve

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