单项选择题
After finished the engine, which of valves cannot be shut off by the duty engineer?（）
A.fuel valve B.the starting air valve C.the sea chest D.the main sea pump inlet valve
单项选择题 After received the “finished with engine” instruction, which of the following operations is false?（）
单项选择题 Which of the following item is the cause to the damage of parts and excess wearing?（）
单项选择题 The main purpose of inspection for a running diesel engine is（）
