钢按化学成份分类,有碳素钢和()。
参考答案:合金钢
— ______ is it from the factory to your house?
— Five minutes' walk. [ ]
A. How far
B. How long
C. How many
D. How much
Ⅰ导联为()
A.标准肢体导联
B.单极肢体导联
C.加压肢体导联
D.胸导联
E.F导联