In order to ensure perfect atomization, the fuel oil （） be

【名词&注释】

中心线(center line)、垂直面(vertical plane)

[单选题]In order to ensure perfect atomization, the fuel oil （） before injection.

A. has to be cooled
B. has heated
C. has preheated
D. has to be preheated

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[单选题]轴系中心线的偏差度反映的是（）的程度。

A. 垂直平面和水平平面上弯曲
B. 垂直面和水平平面上扭转
C. 任意两垂直平面上弯曲
D. 任意两垂直平面上扭转

[单选题]Among the main propulsion units on board the ship with the same capacity, the lightest one is（）.

A. steam engine
B. steam turbine
C. gas turbine
D. diesel engine

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