①选择一个与膨胀的胀紧管相同直径的钻头，安装在电钻上

②把膨胀螺栓套件一起放入孔内

③在墙壁钻孔

④依次放入弹簧垫圈与螺帽，并将螺帽拧紧

⑤取出弹簧垫圈与螺帽，并将平垫物件对准螺栓装上

请分析膨胀螺栓安装流程，正确的应该是（   ）

古代中国的冶铁技术一直领先于世界。冶铁过程中的供风形式不断革新，出现以水力为动力的鼓风装置开始于（    ）

    I have a twin sister, Jenny. She has ____（长的）hair than me. Many people think ____（我们）must have a lot of things in ____（普通的，常见的）. That's not true. Jenny is creative. She won the best ____（奖项）in the school talent show. She likes making friends, so she is more ____（外向的）. But I like staying at home. And I watch TV ____（两次）a week because I have to go to school every day. I always get better ____（分数）but she is much less hard—working. So maybe I should help her. ____（然而）, we also have some similarities. We ____（都）like sports and going shopping, so we can talk about and ____（分享）everything. I love my sister.

在德国出现的由大肠杆菌引起的肠道传染病，因一般抗生素对这种病菌不起作用，导致很多人死亡．大肠杆菌产生耐药性，体现了（　　）