单项选择题
A.lathed B.shaped C.shrunk D.developed
The engine has one or two group of fuel pumps, dependin...
单项选择题The engine has one or two group of fuel pumps, depending upon （）.
A.the number of fuel valves B.the number of cylinders C.the speed of engine D.the power of engine
The energy for pushing this piston up can be supplied f...
单项选择题The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.
A.the same piston B.the piston nearby C.the other pistons D.the generators on board
The efficiency of turbocharge system is increased by fi...
单项选择题The efficiency of turbocharge system is increased by fitting a charge air cooler （） the compressor.
A.inside B.before C.after D.against
