A:a2•a3=a6
B:(﹣a2)3=﹣a5
C:a10÷a9=a(a≠0)
D:(﹣bc)4÷(﹣bc)2=﹣b2c2
—I have a ____class ____ your grandma.
The little girl is fortunate to get help from so many strangers.
一袋精盐重50%千克。