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單項(xiàng)選擇題

In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）

A.opening more bypass lines
B.opening additional expansion valves
C.adding refrigerant
D.speeding up the machine

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單項(xiàng)選擇題

The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）

A.manifold
B.condenser
C.chamber
D.plenum

單項(xiàng)選擇題

If a compressor runs continuously, the cause might be a（）

A.defective thermal bulb
B.clogged scale trap
C.stuck high-pressure switch
D.stuck low-pressure switch

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