A:(2 2 , 2π3 )
B:(﹣4, 2π3 )
C:(﹣4, π3 )
D:(2 2 , π4 )
如图示意图,请据图回答下列问题:
1╳8=8 2╳8=16 5╳8=40 10╳8=80
5╳8=____ 4╳8=____ 5╳8=____ 6╳8=____ 5╳8=____ 7╳8=____
2╳8=____ 3╳8=____ 10╳8=____ 9╳8=____ 10╳8=____ 8╳8=____
0╳8=____ 1╳8=____ 2╳8=____ 3╳8=____ 4╳8=____ 5╳8=____
6╳8=____ 7╳8=____ 8╳8=____ 9╳8=____ 10╳8=____
命题p:∀x∈R,x2+1≥1,则是( )
下列对物体概念的说法中不正确的是( )