— Helen, do you know if Martin to my party next week?
—I think he will come if he free.
A:will come; will be
B:will come; is
C:come; is
D:comes; will be
如图(甲)所示,水平传送带以恒定速率运行,某时刻(t=0)小物块从与传送带等高的光滑平台A处滑上传送带,小物块运动的v﹣t图象(以地面为参考系)如图(乙),g取10m/s2,则( )
手足口病是一种常见的传染病,多发生于婴幼儿。从传染病流行的环节来看,患病的婴幼儿属于( )
我们知道a+b=0时,a3+b3=0也成立,若将a看成a3的立方根,b看成b3的立方根,我们能否得出这样的结论:若两个数的立方根互为相反数,则这两个数也互为相反数.