熔化长度
参考答案：
从熔化开始到固体的宽度降到零为止的螺槽总长。
已知a=log32，那么log38-2log36用a表示是[ ]
A.a-2
B.5a-2
C.3a-（1+a）2
D.3a-a2-1
Read and choose. 给下面的问句选择合适答语填在括号中。
A. No, you can't. It's cold.
B. Yes, it is.
C. They are blue.
D. It's hot.
E. They are on the chair.
( ) 1. What's the weather like today?
( ) 2. Where are your jeans?
( ) 3. Can I wear my new skirt?
( ) 4. Is it warm?
( ) 5. What colour are the books?
