舵系固定件的舵承孔同轴度检验采用（）方法。

【名词&注释】

增压器(turbocharger)、不一定(not always)、不允许(not allow)、光学仪器法

[单选题]舵系固定件的舵承孔同轴度检验采用（）方法。

A. 拉线法
B. 光学仪器法
C. 专用量具
D. 不一定

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学习资料：

[单选题]下列现象中（）会引起增压器振动。Ⅰ.叶片裂纹；Ⅱ.叶片脏污积垢；Ⅲ.气封损坏；Ⅳ.船舶长期停航；Ⅴ.叶片折断。

A. A．Ⅱ＋Ⅳ＋Ⅴ
B. B．Ⅰ＋Ⅱ
C. C．Ⅰ＋Ⅱ＋Ⅴ
D. D．Ⅰ＋Ⅱ＋Ⅳ

[单选题]舵杆不允许有（）。

A. 纵向裂纹
B. 横向裂纹
C. 任意方向裂纹
D. 肉眼可见的横向裂纹

[单选题]（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.

A. An air receiver
B. An operating valve
C. An automatic valve
D. An air distributor

[单选题]All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.

A. angled
B. rounded
C. being angled
D. being rounded

[单选题]Fuel injection valves should be taken out, cleaned, and lifting checked every （）.

A. two to four months
B. four to six months
C. six to eight month

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