21. The expansion valve is the regulator through which the refrigerant flows from
_______________________ of the system .
(A) the high pressure side to the low pressure side
(B) the low pressure side to the high pressure side
(C) the liquid status to the vapor status
(D) the low temperature side to the high temperature side
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膨脹閥是調節器，製冷劑通過它從系統的高壓...
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