[单选题]舵系运动件的同轴度检验采用（）。

正确答案 ：B

拉线法

[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。

正确答案 ：A

0.7

[单选题]After passing through the turbine the exhaust gas is conducted out into the（）.

正确答案 ：D

open air

[单选题]For Vee-form engines, （） is shaped to given two slopping surface on which （） are placed at the correct relative angle to each other.

正确答案 ：C

the top of the column；the cylinder blocks

[单选题]If an electric cargo winch is being used to lift a draft of cargo and the engine room loses all power，which will occur?（）

正确答案 ：B

An electromagnetic brake will hold the load where it is suspended

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