Some of the doctors are paid almost twice as ______ as the nurses. [ ]

A. much

B. many

C. more

D. most

固定使用的发电设备一般选用（）。

A、柴油发电机组

B、燃气轮发电机组

C、便携式汽油发电机组

D、便携式柴油发电机组