4. The three reading strategies helping readers to grasp the main idea of an academictext:
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5. When you write summaries, you should follow some conventions. They are:
6. What criteria can be adopted to evaluate a summary?
7. What are the four steps to summarize an article?
中心距为250mm，安装传动比最接近3.2的标准斜齿圆柱齿轮减速器。根据强度要求，模数取5mm，两轮的齿数应为（）。
A. z1=24，z2=77
B. z1=24，z2=76
C. z1=23，z2=73
D. z1=23，z2=74
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