含氟炉渣溶化性温度低，粘度小，极易侵蚀（），并影响炉缸热量不足。
参考答案：炉衬
用所给单词的适当形式填空.
1. King _____ (dislike) playing sports every day.
2. Bob _____ (have) pen pals in China.
3. I can _____ (write) to you soon.
4. Please write and tell me about _____ (you).
5. They like _____ (go) to the movies.
毛干的结构来看，可分为表皮层、皮质层、（）。
A.髓质层
B.颗粒层
C.基底层
D.真皮层
