单项选择题
A.viscosity B.flash point C.acid value D.temperature
Of a kind of liquid is used to cool the diesel engine, ...
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
If （） are taken at regular intervals, any unequal distr...
单项选择题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
High-speed rotating in a centrifugal purifier can produ...
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 D.at times
