题目内容

活塞顶面裂纹的原因是______。Ⅰ.冷却不良；Ⅱ.过热；Ⅲ.过冷；Ⅳ.顶面积炭严重；Ⅴ.冷却侧结垢严重。

A. Ⅰ＋Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅰ＋Ⅲ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅴ

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在图17—1中，均衡的实际工资率是，同时均衡的就业是10亿小时／年。

A. 50美元；200
B. 10美元；100
C. 30美元；超过300
D. 20美元；125
E. 30美元；150

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The word "spray" (underlined in the third paragraph) means

A. oil mist
B. hot gas
C. injection
D. fuel oil

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In a modern three-phase A.C. synchronous brushes generator, the excitation winding is on the rotor. That means .

A. The generator need not excitation.
B. The winding on the rotor is for inputting excitation current.
C. There are three phase windings on the rotor.
D. The generator has no brushes.

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Cooling water is circulated through______in some injectors.

A. the nozzle
B. the nozzle tip
C. the internal passages
D. the fuel re-circulated

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活塞顶面裂纹的原因是______。Ⅰ.冷却不良；Ⅱ.过热；Ⅲ.过冷；Ⅳ.顶面积炭严重；Ⅴ.冷却侧结垢严重。

A. Ⅰ＋Ⅱ＋Ⅳ B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ C. Ⅰ＋Ⅲ＋Ⅴ D. Ⅰ＋Ⅱ＋Ⅴ

在图17—1中，均衡的实际工资率是________，同时均衡的就业是________10亿小时／年。

The word "spray" (underlined in the third paragraph) means

In a modern three-phase A.C. synchronous brushes generator, the excitation winding is on the rotor. That means .

Cooling water is circulated through______in some injectors.

A. Ⅰ＋Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅰ＋Ⅲ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅴ

在图17—1中，均衡的实际工资率是，同时均衡的就业是10亿小时／年。