单项选择题
The starting air entering the cylinder begins when the piston（）
A.has nearly come to the TDC B.has just past the TDC C.has nearly come to the BDC D.has just past the BDC
单项选择题 In the starting system, the automatic valve is controlled by（）, and the cylinder start valves are controlled by（）
单项选择题 A marine diesel engine is started by（）
单项选择题 In modern installations, the main engine and the standby auxiliary engines（）
