單項(xiàng)選擇題In the closed cooling system, the water （）.

A.is made to circulate out of the system
B.is made to circulate within the system
C.is made circulate within the system
D.is made circulate out of the system


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1.單項(xiàng)選擇題If the temperature drops low enough, oil will not flow, （） just tell us the temperature.

A.Hash point
B.Viscosity
C.Pour point
D.Cetane number

2.單項(xiàng)選擇題The （） can tell us how much heat we can get from the burning of an oil.

A.viscosity
B.flash point
C.cetane number
D.calorific value

3.單項(xiàng)選擇題（） into the cylinder because no fuel can burn （） it.

A.Air must be admitted；without
B.Oil must be injected；without
C.Air must be admitted；with
D.Oil must be injected；with

4.單項(xiàng)選擇題When the fuel oil is burning in the combustion chamber, it （）.

A.gives up large amount of heat
B.gives off large amount of heat
C.gives up large amount of steam
D.gives off large amount of steam

5.單項(xiàng)選擇題After the ship is out of the harbour and in “Full Speed”, well change （）.

A.to fuel oil instead of diesel oil
B.for fuel oil instead of diesel oil
C.to diesel oil into fuel oil
D.for diesel oil into fuel oil