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單項(xiàng)選擇題

Of a kind of liquid is used to cool the diesel engine, it is invariably called （）

A.lubricant
B.coolant
C.combustion product
D.second refrigerant

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單項(xiàng)選擇題

If （） are taken at regular intervals, any unequal distribution of load will be easily found out.

A.differential of crank-webs
B.indicator diagrams
C.lube oil reading out
D.misalignment of crank-throws

單項(xiàng)選擇題

High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.

A.many thousand times
B.between times
C.one time
D.at times

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