A.m＞n                        B.m＜n

C.m=n                         D.m≤n

①若mα,n∥α,则n∥m  ②若m∥α,m∥β,则α∥β 

③若α∩β=n,则n∥m,m∥α且m∥β  ④若m⊥α,m⊥β,则α∥β

A.0           B.1              C.2           D.3

A.θ=1,r=                    B.θ=2,r=

C.θ=2,r=                    D.θ=2,r=

A.m,n都等于1                  B.m,n都不等于2

C.m,n都大于1                  D.m,n至少有一个等于1

A.(0,］                       B.(0,］

C.(0,］                       D.(,π)

(1)当n=1时,≤1+1,不等式成立.

(2)假设n=k(k∈N^*)时,不等式成立,即≤k+1.则n=k+1时,=(k+1)+1.

∴当n=k+1时,不等式成立.上述证法(    )

A.过程全部正确                   B.n=1验证不正确

C.归纳假设不正确                D.从n=k到n=k+1的推理不正确

A.-1＜a＜1                          B.0＜a＜2

C.＜a＜                    D.＜a＜

A.(-∞,)                        B.(-∞,0)∪(0,)

C.(,+∞)                       D.(0,)