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
点击查看答案&解析
相关考题
-
单项选择题
"Scavenging" on a diesel engine means （）.
A.injecting fuel oil into a cylinder
B.removing exhaust gases from the cylinder
C.forcing air into the cylinders under pressure after the exhaust valve has dosed
D.a combination of all the above -
单项选择题
Scavenging is （） of exhaust gases by blowing in fresh air.
A.the suction
B.the compression
C.the removal
D.the deliver -
单项选择题
Rotating flyweights acting against spring pressure make a simple type of （）.
A.governor
B.safety valve
C.reducing valve
D.feed water regulator
