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问题 单项选择题

图示结构E=常数，在给定荷载作用下若使A支座反力为零，则各杆截面惯性矩的关系应为：（）

A.I2=I3

B.I2=4I3

C.I2=2I3

D.I3=4I2

答案

参考答案：D

问答题 论述题

论述叶燮的诗歌正变论。
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填空题

根据句意及首字母（汉语）提示，补全单词。

1. The box is e ______. There is nothing in it.

2. My mother asked me to d______ what my new pen-pal was like.

3. Look! The f ______ are working in the fields.

4. Alice and Jim ______ (结婚) in church last week.

5. Be quiet, please. I have good news to ______ (宣布).
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