We were all at the news.
A:surprising; surprised
B:surprised; surprised
C:surprising; surprising
D:surprised; surprising
上面三幅图分别反映了生活中的什么规则?
如图,半球内有一内接正四棱锥S﹣ABCD,该四棱锥的体积为423,则该半球的体积为____
函数fx=asin12x+π4x∈0,+∞)的周期为____ ,振幅为____ 初相为____ .