正确答案: D

the reading at the rack

题目：Fuel pump index is （）.

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学习资料的答案和解析：

[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。

桨叶平均

[单选题]舵系固定件的舵承孔同轴度检验采用（）方法。

拉线法

[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 （）.

compression ratio