机泵振动的现象是（）。A、泵有噪音 B、泵不上量 C、泵抽空 D、泵扬程不够

《水利水电工程施工质量评定表》(试行)中关于合格率的填写，正确的是( )。

A．0.51

B．92.21%

C．95%

D．42.0%

The experts think that India's population may be _____ than China's _____ 2020.               [ ]

A. much, by

B. larger, by

C. more, in

清政府最早修筑的铁路是[ ]

A．滇越铁路

B．淞沪铁路

C．唐胥铁路

D．京张铁路

His parents __________ him to work in a big company but he failed them.

A．suggested

B．demanded

C．recommended

D．hoped

什么是转子的不稳定接地？