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As a general rule, the first troubleshooting action to be taken in checking faulty electri
A.draw a one line diagram of the circuitry
B.test all fuses and measure the line voltage
C.take megger readings
D.insulate the apparatus from ground
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A.draw a one line diagram of the circuitry
B.test all fuses and measure the line voltage
C.take megger readings
D.insulate the apparatus from ground
第1题
A.thousandth ( 10 to the - 3rd power)
B.millionth (10 to the -6th power)
C.billionth ( 10 to the - 9th power)
D.trillionth (10 to the - 12th power)
第2题
A.metal
B.wood
C.water
D.plastic
第3题
A.I only is correct
B.Ⅱ only is correct
C.both I and Ⅱ are correct
D.neither I or Ⅱ are correct
第4题
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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