单项选择题
A.the bearing clearances B.the bearing thickness C.the bearing strength D.the bridge hardness
Sediment collects in a tubular purifier （）.A.on top cov...
单项选择题Sediment collects in a tubular purifier （）.
A.on top cover B.on sides of bowl C.in drain line on the discs D.on the discs
Sea water is not used directly as a coolant because of ...
单项选择题Sea water is not used directly as a coolant because of （）.
A.low specific heat B.high specific heat C.corrosive action D.high viscosity
Sea water is not directly used as a coolant for engines...
单项选择题Sea water is not directly used as a coolant for engines because of its （）.
A.low specific heat B.corrosive action C.high expense D.acid property
