题目内容
设由疲劳强度决定的带的许用拉应力为[σ]，带内的初应力σ。，紧边拉应力σ1、松边拉应力σ2、在小带轮上的弯曲应力σb1、在大带轮上的弯曲应力σb2、离心应力σc，则从带的拉伸疲劳强度出发，应有( )。
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带传动的圆周速度V>5m/s是有利于提高承载能力，而V<25m/s是主要为了( )。
设计带传动时，中心距一定的小带轮上的包角大小取决于( )，而带的长度取决于大、小带轮的直径。
A段和E段为给定顺序（就是A段和E段的位置符合字母表的顺序，也就是说，第一段选A，第五段选E。不好意思没说清楚。）。多余选项填入最后的空中。
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