在压力容器破坏事故中，有相当一部分是由于结构不合理引起的。
参考答案：对
用所给单词的适当形式填空。
1. He _____(bring) the book to me yesterday.
2. There are many _____(leaf) on the ground in fall.
3. I finished _____(do) my homework.
4. The baby stopped _____(cry) when she saw her mother.
5. He _____(be) back in an hour.
局部组织因血流阻断而引起的坏死称为
A．栓塞
B．血栓形成
C．机化
D．梗死
E．软化
