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單項選擇題

There will usually be summaries or daily account tables for heavy oil, diesel oil, lubricating oil, and fresh water, which will be compiled（）

A.at the beginning of every watch
B.at the beginning of the first watch every day
C.at the completion of every watch
D.at noon every day

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單項選擇題

According to the principle of two stroke diesel engine, what is the number of its efficient work stroke per revolution?（）

A.1/2
B.1
C.2
D.3

單項選擇題

Which of the following pumps will most affect oily water separator performance and give the worst result?（）

A.reciprocating pump
B.vane pump
C.screw pump
D.centrifugal pump

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