铺钉道岔钢轨，一般按（）的顺序进行。
A.铺钉直股及辙叉→铺导曲线外股钢轨→铺导曲线内股钢轨→安装连接杆和安装转辙机械
B.安装连接杆→铺导曲线外股钢轨→铺导曲线内股钢轨→铺钉直股及辙叉和安装转辙机械
C.铺钉直股及辙叉→铺导曲线内股钢轨→铺导曲线外股钢轨→安装连接杆和安装转辙机械
D.铺钉直股及辙叉→铺导曲线外股钢轨→安装转辙机械→安装连接杆和铺导曲线内股钢轨
参考答案：A
观察表格，完成下列各小题。
1. Which is the cheapest (便宜的) of all? A. Hat. B. T-shirt. C. Pants. D. Socks. 2. How much are two sweaters and a hat? A. $14. B. $20. C. $21. D. $22. 3. You can buy _____ in Mason's Clothes Store. A. black pants B. a blue sweater C. a green hat D. red socks 4. You like red and you only have $6. You can buy_____. A. a sweater B. a hat C. a T-shirt D. none (全无) 5. You only have sixteen dollars. You can buy_____. A. a sweater and a pair of pants B. two T-shirts and a pair of socks C. two sweaters D. a sweater and two hats | |||||||||||||||||||||