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
查看答案
The word "spray" (underlined in the third paragraph) means
A. oil mist
B. hot gas
C. injection
D. fuel oil
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.
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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