单项选择题
When the diesel is stopped, which of the following items is wrong?（）
A.keep all systems in normally running B.the main engine is stand-by C.shut off the starting air bottle outlet valve D.pay attention to the changes of the system parameters
单项选择题 After finished the engine, which of valves cannot be shut off by the duty engineer?（）
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?（）
