单项选择题
A.open-type
B.hermetic
C.semi-hermetic
D.all the above
单项选择题 Which of the following will be desirable properties of refrigerant?（） (1) non-explosive (2) non-corrosive (3) that it doesn’t react with lubricants
单项选择题 In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly （）.
单项选择题 The refrigerant flows through the evaporator, where it （） heat from the refrigerated space.