不属于离心式制冷机组主要操作参数的有（）
A、轴振动
B、轴位移
C、压缩机油冷器前油温度
D、压缩机入口压力
参考答案：C
The more ______ we take the safety standards, the further we can speed up the development
of the school bus industry. [ ]
A. constantly
B. generally
C. seriously
D. immediately
经过两点能画______条直线，经过一点能画______条直线．
