A.74
B.86
C.98
D.125
[单选题],,,,,( )。A.B.C.D.
[单选题],,,,1,( )。A.B.3C.D.
[单选题],,,,( )。A.B.C.D.
[单选题]2,1,,,,( )。A.B.C.D.
[单选题]2,1,,,,( )。A.B.C.D.
[单选题]2,1,,,,( )。A.B.C.D.
[单选题]2,1,,,,( )。A.B.C.D.
[单选题]2,1,,,,( )。A.B.C.D.
[单选题]9,6,,4,( )。A.2B.C.3D.
[单选题]杯里全是水,倒出装入纯酒精,又倒出装入纯酒精,再倒出装入纯酒精,问现在酒精浓度是多少?( )A.50%B.60%C.70%D.80%