题目： 链型悬挂有那些特点？ 答案： 参考答案：（1）接触线增加了悬挂点，使得接触线高度一致，改善了接触悬挂弹性；（2）增加承力索和吊弦，悬挂的重量加大了，从而增加了悬挂的稳定性；（3）结构复杂，投资大，施工和维修任务增加。
题型：选择题 — ______ made Daisy wild with joy?— Her success in the A-level exam this year. [ ]A. How was it that B. When was it thatC. Why was it that D. What was it that 查看答案
