A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C
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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
A.need to repair
B.need to be repaired
C.needs to repair
D.needs repairing
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