某发动机的燃烧室容积0.1L,气缸工作容积0.5L,压缩比为()。
A.12
B.8
C.6
D.4
参考答案:C
Excuse me for _____ in without ______.
A.coming, asking
B.coming, being asked
C.to come, asking
D.to come, being asked
有一台电动机额定电压为380V,正常工作时通过的电流是5A,输出的功率是1.5kW,问:
(1)该电动机的效率是多少?
(2)试分析该电动机能量的转化.