下列几个物理量中可以用来鉴别物质的种类的是[ ]
Ａ、质量
Ｂ、密度
Ｃ、体积
Ｄ、温度
答案：B
改错。
( ) 1. What is she name? ________________
A B C
( ) 2. I likes Chinese food. ________________
( ) 3. Look in the board. ________________
( ) 4. Mike looks a strong. ________________
( ) 5. This's my new school. ________________
关于x的方程x3-3x-a=0有三个不等的实根，则实数a的取值范围是______．
