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


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

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

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