题目内容

在带传动中,要求小带轮的直径不能太小,主要是为了____________(防止包角过小、控制包角大小、防止带的弯曲应力过大)。反之,若小带轮直径太大,则会__________(包角过大、包角过小、整体结构尺寸过大)。

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V带、齿轮、链条用于多级传动中,带传动一般用于__________(高速级、中间级、低速级、输出级),而链传动一般用于______(高速级、中间级、低速级、输出级)。

带传动的传动比不宜过大,若传动比过大,将使小带轮的包角______(变小、变大),从而使带传动的有效拉力______(增加、减小),

带在工作过程中,主要有以下应力________。

A. 紧边、松边拉应力
B. 离心拉应力
C. 剪切应力
D. 扭转应力
E. 弯曲应力
F. 接触应力

Vocabulary and Structure (10 minutes)Directions: This part is to test your ability to construct correct and meaningful sentences. It consists of 2 sections.Section ADirections: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A, B, C and D. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.The task will not be fulfilled_______ we get help from other departments.

A. If
B. unless
C. since
D. when

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