化工行业常用的大中型压缩机，首先是以（）为第一要求。
A.省功
B.运转可靠
C.省功、运转可靠
D.排气温度低
参考答案：C
In a regulated industry, the introduction of a marginal cost pricing role that maximizes total surplus would most likely be viewed as:（）
A. inefficient but leaves the natural monopoly incurring an economic loss.
B. inefficient and allows the natural monopoly to realize an economic gain.
C. efficient but leaves the natural monopoly incurring an economic loss.
手足震颤与下列何项有关
A．阴虚动风证
B．血虚生风证
C．肝阳化风证
D．热极生风证
