问题
单项选择题
开式齿轮传动的最常见失效形式是（）
A．齿面点蚀
B．齿面磨损、齿轮磨薄后被折断
C．齿面胶合
D．齿面塑性变形
答案
参考答案：B
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开式齿轮传动的最常见失效形式是（）
A．齿面点蚀
B．齿面磨损、齿轮磨薄后被折断
C．齿面胶合
D．齿面塑性变形
参考答案：B
Passage 1
Which of the following is true about the diet of British people a. They usually prefer British food when eating at home. b. They have non-British food only when eating out. c. They do not like Chinese food very much. d. Their everyday cuisine is diversified.