桥梁结构一般由()组成。
A.上部结构
B.支座
C.天桥
D.下部结构
E.基础和附属结构
参考答案:A, B, D
解析:桥梁一般由上部结构、支座、下部结构、基础和附属结构组成。
含棉16%、涤纶短纤84%的染色平纹机织物,每平方米重量为210克。
Speaker A: Do you mind if I sit down here Speaker B: ()。
A. Of course. Do sit down, please.
B. Not at all. There’s plenty of room.
C. Never mind. I’d like to have some companion.
D. Sure, I’d like to have somebody to talk to.