单项选择题
A.amount of superheat in the vapor leaving the coil B.amount of superheat in the liquid C.temperature in the evaporator coils D.pressure in the evaporator coils
The thermostatic valve has a throttling action, that is...
单项选择题The thermostatic valve has a throttling action, that is to say the valve can（）
A.stop the refrigerant from flowing B.force the refrigerant to flow C.cause the refrigerant pressure to rise D.cause the refrigerant pressure to fall
When the refrigeration demand is small,（）A.the expansio...
单项选择题When the refrigeration demand is small,（）
A.the expansion valve will move toward the wide open position B.the expansion valve will move toward the closing position C.the feeler bulb will conveys the high temperature D.the superheat degree will raise
When the heat load begins to increase, the needle valve...
单项选择题When the heat load begins to increase, the needle valve of an expansion valve will（）
A.move in an opening direction B.move in a closing direction C.either open or close D.not move at all
