單項(xiàng)選擇題

If the head pressure is too high,（）

A.the relief valve should open before the high-pressure cutout
B.the relief valve should open and let excess refrigerant go to receiver
C.the high-pressure cutout switch should operate before the relief valve opens
D.close in on the suction valve

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單項(xiàng)選擇題

If no gaskets are used in the piping joints of a Freon system, the joints must be（）

A.finished joints
B.welded joints
C.ground joints
D.soldered joints

單項(xiàng)選擇題

If the temperature in the icebox is too high, the trouble could be（）

A.a clogged scale trap
B.air in the system
C.automatic controls not functioning properly
D.insufficient cooling water to the condenser