正确答案: A

修磨

题目：螺旋桨桨叶A区内的深度＜t为/40（t为叶厚，mm）或4mm的缺陷可以采用（）其中较大的缺陷。

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学习资料的答案和解析：

[单选题]消除螺旋桨鸣音的具体办法是将桨叶随边0.4R～0.8R部分（）等抗鸣边缘，从而改变涡流引起的振动频率，也就不会与桨叶固有振动频率产生共振。Ⅰ.加厚；Ⅱ.减薄；Ⅲ.形成锯齿状；Ⅳ.质量改变；Ⅴ.钻孔。

Ⅰ＋Ⅱ＋Ⅲ＋Ⅴ

[单选题]某螺旋桨半径为2m，将装于其上的螺距规的水平杆旋转36°时量杆的升程为256mm，其局部螺距为（）。

2560mm

[单选题]二冲程柴油机停增压器运转时使用电动鼓风机供气，此时柴油机可达到标定功率的（）。

25%

[单选题]The indicated power of an engine can be obtained by taking the （）.

B and C

[单选题]The primary duty of lube oil is to reduce （） between the working parts of an engine.

friction and wear

[单选题]When the follower is on the base circle of the cam, the pump plunger is at the （） of its stroke.

bottom

[单选题]When we say that two objects have relative motion, we mean （）.

the distance between them is changing

[单选题]Fuel is admitted to a diesel engine cylinder through the （）.

injector nozzle