单项选择题

蠕变产生的塑性变形在很短的时间内发生。
A、正确
B、错误

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Directions: Suppose you are the sales manager of the QC department of HPA Company; write a proposal about the quality problems of your company and the possible solution. Write more than 200 words.

答案：略

单项选择题

嵌顿疝最常见的疝内容物是（

A．大网膜
B．小肠
C．盲肠
D．阑尾
E．乙状结肠