單項(xiàng)選擇題If the atomizer holes are enlarged beyond the makers recommended size, the atomizer must be ().

A.repaired
B.replaced
C.replenished
D.repeated


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1.單項(xiàng)選擇題If diesel oil in this tank is used, the () of the oil must not exceed 120 degree F.

A.viscosity
B.flash point
C.acid value
D.temperature

2.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

3.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

4.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