单项选择题
A.β=(β==22.8<μ1μ2[β]=24 B.β=(β==16.7<μ1μ2[β]=24 C.β=(β==10<μ1μ2[β]=24 D.β=(β==10<μ1μ2[β]=20.4
A.aM=0.450,ηn=1.250 B.aM=0.432,ηn=1.430 C.aM=0.406,ηn=1.430 D.aM=0.485,ηn=1.336