A.turn off power first
B.turn on power first
C.with a test pen in hand
D.tell C/E
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A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C
A.either；or
B.neither；nor
C.such；that
D.so；that
A.that
B.when
C.if
D.whether
A.rise, rise also
B.rise, drop
C.drop, rise
D.drop, drop also
A.excessive internal leakage in the pump
B.low discharge pressure and fluid flow
C.excessive fluid level in the hydraulic reservoir
D.operation of the pump at 100% efficiency
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