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单选题
The presence of air in the condenser of a refrigeration system will （） the condensing pressure.
A
increase
B
reduce
C
maintain constant
D
None of the above is true
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anyof（1）and（3）D
anyof（1）and（2）
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The king valve and the solenoid valveC
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The condenser and the solenoid valve
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单选题The presence of bubbles in a refrigeration system liquid line may （）.A
promote refrigerant dehydrationB
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cause low condensing pressureD
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