单项选择题
A.open-type B.hermetic C.semi-hermetic D.all the above
Which of the following will be desirable properties of ...
Which of the following will be desirable properties of refrigerant?（） (1) non-explosive (2) non-corrosive (3) that it doesn’t react with lubricants
A.(1), (2) and (3) B.(1) and (2) C.(1) and (3) D.(2) and (3)
In practice, the refrigerant flow after the evaporator ...
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 （）.
A.saturated B.super-cooled C.wet D.superheated
The refrigerant flows through the evaporator, where it ...
单项选择题The refrigerant flows through the evaporator, where it （） heat from the refrigerated space.
A.extracts B.releases C.gives no D.absorbs no
