單項(xiàng)選擇題The cooling system（） needs least maintenance work for in this kind of system（）

A.open；the minimum components
B.open；the high cooling efficiency
C.central；there are more coolers and a extra set of pumps
D.central；there is only one component contacts seawater


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1.單項(xiàng)選擇題An alarm device inserted between the deaerating tank and the expansion tank can notify the on-watching crew that （）

A.the expansion tank is lack of water
B.the expansion tank is over flowing
C.there is something wrong with the cooling system
D.there is something wrong with the engine

2.單項(xiàng)選擇題As an alternative to the conventional seawater cooling system, is based on principles about cooler locations, （）flow control and preheating, but with a central cooler and one additional set of pumps（）.

A.the central cooling system, different
B.the central cooling system, the same
C.the open cooling system, different
D.the open cooling system, the same