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
单项选择题 Sea water is not directly used as a coolant for engines because of its （）.
单项选择题 "Scavenging" on a diesel engine means （）.
单项选择题 Scavenging is （） of exhaust gases by blowing in fresh air.
