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
单项选择题 The efficiency of turbocharge system is increased by fitting a charge air cooler （） the compressor.
单项选择题 The distance from TDC to BDC of the diesel engine is called （）.
单项选择题 The diffuser prevents pressure pulses from one cylinder （） another during operation.
