單項(xiàng)選擇題The () is used to measure the volume of a liquid or gas through a pipeline within any given period of time.

A.flowmeter
B.viscometer
C.micrometer
D.feeler


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1.單項(xiàng)選擇題Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to().

A.reduce electrolytic action on heat exchanger metals
B.keep heat transfer surfaces shiny and clean
C.prevent rapid accumulation of marine growth
D.provide a protective coating on heat exchanger surfaces

2.單項(xiàng)選擇題With a () load the voltage and current are in phase.

A.pure resistance
B.capacitive
C.inductive
D.None of the above

3.單項(xiàng)選擇題The star-delta starter is an effective method of () voltage starting of a motor.

A.increased
B.reduced
C.unchanged
D.None of the above

5.單項(xiàng)選擇題The operation of paralleling two alternators requires the voltages to be ()and also in phase.

A.zero
B.eliminated
C.different
D.equal