问题
名词解释
桁架
答案
参考答案：
石油连杆组成的格构体系，当荷载作用在结点上时，杆件仅承受轴向力，截面上只有均匀分布的正应力，是最理想的一种结构形式。
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桁架
参考答案：
石油连杆组成的格构体系，当荷载作用在结点上时，杆件仅承受轴向力，截面上只有均匀分布的正应力，是最理想的一种结构形式。
| 用方框内所给单词的适当形式填空。 | |
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| 1. It __________ that your sister hasn't changed at all these years. 2. Her pet's __________ made her sad for a long time. 3. Bad weather can __________ problems for many farmers. 4. The little boy ate all the __________ at the party. 5. The girl said she was terrified of __________. She'd rather go by sea. |