使用含重碳酸盐较多的水作为冷却水,当它通过换热器传热表面时,会受热分解产生()垢。
A、硫酸钙
B、硅酸钙
C、碳酸钙
D、磷酸钙
参考答案:C
These reference books donated by a non-profitable organization are available for ____ wants to have it.
A.anyone
B.someone
C.who
D.whoever
醋炙后,可增强的作用是
A.活血通络
B.润肺止咳
C.活血止痛
D.降逆止呕
E.滋润降火