合金工具钢和碳素工具钢因其耐热性差只能用于手工工具。
参考答案：对
The Audiolingual Method is a method of foreign or second language teaching which emphasizes the （）.
A. listening and reading before speaking and writing
B. listening and speaking before reading and writing
C. listening and speaking before translating and writing
D. reading and writing before listening and speaking
原位癌
