铸钢锚链的优点是:()
①、强度较高,刚性好;②、撑档不会松动,使用年限长;③、工艺简单,成本较低,耐冲击负荷强
A.①、②、③
B.①、②
C.②、③
D.①、③
参考答案:B
— ___ you ___ him around the museum yet?
— Yes. We had a great time there. [ ]
A. Have … shown
B. Do … show
C. Had … shown
D. Did … show
什么是建筑接近限界?