（）是在钢中加入较多的钨、钼、铬、钒等合金元素，用于制造形状复杂的切削刀具。
A.硬质合金
B.高速钢
C.合金工具钢
D.碳素工具钢
参考答案：B
用所给词的适当形式填空。
1. I don't like the mall because it's much too _______ (crowd).
2. I decide _______ (have) a talk with the boys.
3. I want to get some _ ____ (information) about the town.
4. We should learn to speak _ _ _ (polite).
5. Every year many _______ (tour) come to Beijing.
大面积烧伤患者置于经彻底消毒的房间，房间墙壁、家具、地板每天用消毒液抹拖__次，空气消毒______次。
