Measure （） by means of lead wire.

【名词&注释】

螺旋桨(propeller)、轴系理论中心线

[单选题]Measure （） by means of lead wire.

A. the clearance of the main bearing
B. the play of the miler bearing
C. the gap of the main bearing
D. the tolerance of the main bearing

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学习资料：

[单选题]气缸盖底面在较高的（）等的恶劣条件下工作。Ⅰ.交变的机械负荷；Ⅱ.热负荷；Ⅲ.燃气腐蚀阀、孔；Ⅳ.冲刷；Ⅴ.冲击。

A. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅴ
C. Ⅱ＋Ⅲ＋Ⅳ
D. Ⅱ＋Ⅲ

[单选题]当曲柄的Δ＝（＋）值时，该曲柄的两个主轴承位置较（），曲轴轴线呈（）状态。

A. 低/“∪”
B. 高/“∪”
C. 低/“∩”
D. 高/“∩”

[单选题]轴系理论中心线是（）的定位安装基准。

A. 螺旋桨
B. 舵系
C. 中间轴
D. 主机

[单选题]在进行舵系固定件同轴度检验时，拉出舵系固定件中心线的钢丝线后，测量各舵承孔至钢丝线的（）距离，以确定各舵承孔的同轴度偏差。

A. 上下、左右
B. 前后、左右
C. 上下、前后
D. 空间

[单选题]The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.

A. temperature
B. pumping rate
C. pressure
D. heat

[单选题]In order to reverse the rotation of a two-stroke/cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions must be changed for the （）.

A. starting air and fuel pumps
B. piston cooling pumps
C. exhaust valves
D. all of the above

[单选题]Auxiliary boilers are divided into several classifications, one of which is （）.

A. water-tube supercritical circulation
B. water-tube forced circulation
C. fire-tube controlled circulation
D. fire-tube express circulatio

[单选题]White smoke exhausting from an operating diesel engine may indicate （）.

A. a cracked liner
B. burning lube oil
C. an overloaded engine
D. insufficient combustion air

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