Heat energy is a source of power, but （） will cause damage

【名词&注释】

国内外

[单选题]Heat energy is a source of power, but （） will cause damage to the engine.

A. excessive heat
B. insufficient heat
C. effective cooling
D. high output

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学习资料：

[单选题]气缸盖底面裂纹一般产生在底面阀孔边缘和阀孔之间，即有（）的部位。

A. 应力
B. 较高应力
C. 应力集中
D. 拉应力

[单选题]目前国内外均以（S＋D）/2为测量点A制定臂距差标准，若在大于（S＋D）/2处的B点测量，则臂距差ΔB必定（）。

A. ＞ΔA
B. ＝ΔA
C. ＜ΔA
D. ≥ΔA

[单选题]修船时，抽出艉轴后立即用湿草包填塞于艉轴承内，这是为了（）。

A. 保护艉轴承精度
B. 防止异物损伤轴承
C. 防止铁梨木产生裂纹
D. 防止艉轴承变形

[单选题]A diesel engine is similar to a gasoline engine except that the former has no （）.

A. cross-head
B. cylinder
C. connecting rod
D. spark plug

[单选题]As to the piston cooling, of the following, which statement is not true?（）

A. Because the piston is exposed to very high temperature, it must be cooled
B. The lower the piston cooling temperature is, the better it is
C. Both water and lube oil can be used as coolant
D. One of the piston cooling methods is vibration cooling, with better effect

[单选题]If you are unable to stop a diesel engine by any other means，you should（）.

A. discharge a CO2 extinguisher in the air inlet
B. pull off the distributor cap
C. secure the jacket water
D. secure the starting air supply valve

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