屋架与横梁一样,都是杆件,屋架上弦杆受()力作用;下弦杆受()力作用。
参考答案:压、拉
找出与画线单词意思相近的词。
1. Kim placed her name on the list. A. saw B. put C. said D. crossed
2. I nearly missed the bus. A. always B. very C. almost D. did
3. Mike ran fast towords the house. A. quickly . B. far C. recklessly D. away.
架空线路选线进行路径方案比较时应考虑哪些因素?