A.绝对不能代用
B.能代用,且轴上输出功率为PN
C.能代用,且轴上输出功率为ηPN
D.能代用,且轴上输出功率为PN/η
第1题
A.Kaifeng
B.Luoyang
C.Beijing
D.Changan
E.Guangzhou
F.Sichuan
第2题
A.Chang’an
B.Luoyang
C.Xing Jiang
D.Dun Huang
第3题
A、Northern Silk Road on the land
B、Eastern Silk Road on the sea
C、Western Silk Road on the land
D、Northern Silk Road on the sea
第4题
A.Northern Silk Road on the land
B.Eastern Silk Road on the sea
C.Western Silk Road on the land
D.A. Northern Silk Road on the sea
第5题
Along the Old Silk Road there are ().
A. grottoes
B. Buddist temples
C. ancient city remains
D. historical sites
第6题
A、Eastern Silk Road on the sea
B、Northern Silk Road on the sea
C、Western Silk Road on the land
D、Northern Silk Road on the land
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