单项选择题
"gauge pressure" means（）.
A."vacuum"
B."the excess of pressure above atmosphere"
C."figure on a gauge"
D.Any of the above
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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 -
单项选择题
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 -
单项选择题
With a （） load the voltage and current are in phase.
A.pure resistance
B.capacitive
C.inductive
D.None of the above
