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The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.
A:increase the refrigerating effect, by decreasing the amount of flash gas
B:allow the refrigerant to enter the throttling device in a saturated condition
C:increase the refrigerating effect by increasing the amount of flash gas
D:minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side

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出自：海船船员证

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