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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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出自：海船船员证

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