Fuel pump index is （）.

【名词&注释】

算术平均值(arithmetic mean)、不一定(not always)、光学仪器法

[单选题]Fuel pump index is （）.

A. the viscosity index
B. the fuel oil contents
C. the starting speed
D. the reading at the rack

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学习资料：

[单选题]桨叶上各半径截面上的截面螺距的算术平均值称为（）螺距。

A. 桨叶
B. 桨叶总
C. 桨叶平均
D. 桨叶实测

[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

[单选题]A distance piece, with ground faces, may be interposed between the rod and the bearing housing, its thickness being chosen to ensure the correct （）.

A. expansion ratio
B. pressure ratio
C. compression ratio
D. clearance ratio

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