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.
单项选择题 Rotating flyweights acting against spring pressure make a simple type of （）.
单项选择题 Remote control means that the system is being controlled by the operator who is situated （） from the system.
