舵叶轴承孔与舵杆工作轴颈的同轴度偏差不得大于（）倍的舵承安装

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[单选题]舵叶轴承孔与舵杆工作轴颈的同轴度偏差不得大于（）倍的舵承安装间隙。

A. 0.7
B. 1.0
C. 1.25
D. 1.5

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学习资料：

[单选题]Engine （） refers to the relative time of position of crank, at which each operation during the cycle is commenced and is completed.

A. timing
B. power
C. firing order
D. dead center

[单选题]The sequence of parts in a generally used fuel oil supply system for a main engine is （）(1)tanks in the double bottom(2)centrifuges(3)service tank(4)settling tank(5)viscosity regulator

A. (1)-(2)-(4)-(3)-(5)
B. (1)-(4)-(2)-(3)-(5)
C. (1)-(3)-(2)-(4)-(5)
D. (1)-(5)-(4)-(2)-(3)

[单选题]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

[单选题]Fusible plugs are installed in fire-tube boilers to （）.

A. provide a means of draining the boiler
B. warn the engineer of low water level
C. cool the crown sheet at high firing rates
D. open the burners electrical firing circuit

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