Diesel engines are started by supplying （） into the cylind

【名词&注释】

柴油机(diesel engine)、直线度(straightness)、螺旋桨桨叶(propeller blades)、不允许(not allow)、理论中心线(theoretical centerline)、实际中心线(actual center-line)

[单选题]Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

A. fuel oil
B. diesel oil
C. compressed air
D. jacket water

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学习资料：

[单选题]若已知曲轴的轴线状态呈拱腰形，则其两主轴承高度必然（）于相邻轴承，测得臂距差为（）值。

A. 低/正
B. 低/负
C. 高/正
D. 高/负

[单选题]在柴油机投入使用一年或大修后，一般均要进行一次贯穿螺栓预紧力检查，检查时（）。

A. A．应当松开全部的主轴承螺栓
B. B．应当松开全部底脚螺栓
C. C．不允许松开任何底脚螺栓和贯穿螺栓
D. D．应当松开全部的底脚螺栓和贯穿螺栓

[单选题]轴系中心线的偏差度是指（）。

A. 轴系中心线弯曲变形程度
B. 轴系中心线的直线度
C. 轴系实际中心线^{(actual center-line)}与理论中心线^{(theoretical centerline)}的偏差
D. 轴系中心线校中状态与理论中心线^{(theoretical centerline)}的偏差

[单选题]根据缺陷在螺旋桨桨叶上的部位不同和所造成的危害程度不同，将桨叶表面缺陷分为（）个区域。

A. 2
B. 3
C. 4
D. 5

[单选题]Compressed air is used on board ship （）.

A. for starting diesel engines
B. in pneumatic control system
C. in pneumatic tools
D. All the above are true

[单选题]Dirty oil must be （） before being used again.

A. mixed with clean oil
B. purified
C. heated
D. strained

[单选题]The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives them Whats the meaning of “that” in the sentence above？

A. less than
B. lighter than
C. larger than
D. smaller tha

[单选题]Fins are installed on the generating tube surfaces in waste heat boilers to （）.

A. prevent soot fires in the exhaust system
B. prevent exhaust gas erosion of the tubes
C. increase the velocity of exhaust gas flow
D. increase the rate of heat transfer

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