单项选择题
A.reducing speed to SLOW and asking bridge for permission to stop
B.stopping the fuel oil supply
C.switching-on the auxiliary blowers
D.putting the scavenge air box fire extinguishing equipment into function
单项选择题 On what do you depend having the air cooler of main engine chemically washed?（）
单项选择题 In a four stroke engine, which process lasts the longest period?（）
单项选择题 In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）