A.μ1〈μ2 B.μ1〉μ2 C.σ1〈σ2 D.σ1〉σ2
A.對任意實(shí)數(shù),都有p1=p2 B.對任意實(shí)數(shù),都有p1
2 C.對任意實(shí)數(shù),都有p1>p2 D.對任意實(shí)數(shù),都有p1≠p2