题目内容

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），

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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

We’ll send the memo in advance _______ all people can have enough time to get prepared.

A. In case
B. so that
C. as if
D. ever since

congratulations on the great ______ you’ve made since last year.

A. Progress
B. measure
C. appointment
D. sense