单项选择题

当有效汽蚀余量小于零的时候,水泵( ) A.
水泵一定不会发生汽蚀 B.
水泵有可能发生汽蚀 C.
水泵是否发生汽蚀与水泵的特性有关 D.
水泵一定会发生汽蚀

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单项选择题

Which of the uppercased nouns is converted from verb according to ‘N= instrument of V’?()

A．many IMPORTS
B．a mountain PASS
C．a waste DUMP
D．a shoe POLISH

不定项选择

A group presentation is an integrated speech, different parts of which are presented by different speakers.

A．正确
B．错误