單項(xiàng)選擇題

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

A.Cooling water is alkalescence
B.cooling water is acidity
C.cooling water has salinity
D.cooling water has impurity

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單項(xiàng)選擇題

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

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

單項(xiàng)選擇題

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