可用作弹簧的钢是()。
A.20
B.9SiCr
C.60Si2Mn
D.20CrMnMo
参考答案:C
关于(-3)4的正确说法是( )
A.-3是底数,4是幂
B.-3是底数,4是指数,-81是幂
C.3是底数,4是指数,81是幂
D.-3是底数,4是指数,81是幂
Last weekend, Linda had a very exciting _____.She went to have fun with her friends in Disneyland.
A. news B. information C. experience