单项选择题
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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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 -
单项选择题
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
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Here some oil in the oily water separator, as a result of its lower （）, will separate and rise into the oil collection space.
A.temperature
B.viscosity
C.density
D.velocity
