高层建筑采用钢筋混凝土筒中筒结构时，外筒柱子截面设计成下列哪种截面为最好 A．圆形截 发布时间：2017-12-05 12:56 │ 来源：www.tikuol.com 题型：单项选择题 问题： 高层建筑采用钢筋混凝土筒中筒结构时，外筒柱子截面设计成下列哪种截面为最好A．圆形截面B．正方形截面C．矩形截面，长边平行外墙放置D．矩形截面，短边平行外墙放置
题型：单项选择题 选择正确单词完成下列短文。 I 1 writing a letter 2 my cousin. I write with a pen. I write 3 a piece of paper. 4 the top of the letter, I write the day. What day is it? It's Thursday, March 12th. I write my name at the bottom of 5 letter. I put my letter in an envelope. Now, I write the address on the envelope.( ) 1. A. is ( ) 2. A. on ( ) 3. A. on ( ) 4. A. Are ( ) 5. A. the B. are B. to B. with B. On B. on C. am C. in C. at C. Up C. many 根据上面的短文回答问题。1. What are you doing? 2. What day is it? 3. Where do you write your name? 4. Do you put your letter in an envelope? 5. Where do you write the address? 查看答案