单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）AAt the designed operating temperature, the liquid refrigerant charge has changed to a vaporBThe liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityCThe sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureDThe sensing bulb is never emptied of liquid refrigerant under normal operating conditions
单选题
Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）
A
At the designed operating temperature, the liquid refrigerant charge has changed to a vapor
B
The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity
C
The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature
D
The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
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