单项选择题
The tendency of a flammable liquid to vaporize is indicated by its （）.
A.ignition temperature B.flash point C.flammable range D.convection index
单项选择题 Moisture in the refrigerant may （）.
单项选择题 Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?（）
单项选择题 Moisture is removed from a refrigeration system by（）.
