Why the cooling water of the diesel engine should be treated? Because the（）

单项选择题The cooling water of the diesel engine should be treated, because it has（）

A.alkale scence
B.acidity
C.salinity
D.impurity

单项选择题When received the order finished with engine which of the following operations is wrong?（）

A.stop the LO pump, SW pump, FW pump
B.stop the priming FO transfer pump
C.engage the turning gear
D.open the scavenge air belts drain valve and cover the turbocharger silencer with the dustproof cover

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?（）

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?（）

A.shut off the starting air receiver outlet valve
B.stop the FO priming transfer pump and shut off the correspondence inlet and outlet valve
C.stop the SW pump immediately and shut off the correspondence inlet and outlet valve
D.stop the FW pump immediately and shut off the correspondence inlet and outlet valve