单项选择题
A.an injection process
B.an ejection process
C.a separation process
D.a heating process
单项选择题 The oil sump, a light welded design, is mounted on the engine block from below and sealed by （）
单项选择题 The air required for combustion is taken from the engine room through a filter fitted on the turbochargerThis reduces the risk for too and contamination of the combustion air（）
单项选择题 Engines, which are to be run in parallel have governors specially adapted for the same（）, about 4% to obtain basic load sharing.