A.550~570ppm
B.0.5~0.6ppm
C.800~900ppm
D.440~460ppm
[单选题]A.iB.n-iC.n-i+lD.不确定
[单选题]A.0.1~0.19㎡B.0.2~0.29㎡C.0.3~0.39㎡D.0.4~0.59㎡
[单选题]A.0.1~0.19㎡B.0.2~0.29㎡C.0.3~0.39㎡D.0.4~0.59㎡
[单选题]A.550~570ppmB.0.5~0.6ppmC.800~900ppmD.440~460ppm
[单选题]A.200%B.300%C.400%D.500%
[单选题]A.200%B.300%C.400%D.500%
[单选题]A.B.C.P(AB)=P(A)P(B)D.P(AB)≠P(A)P(B)E.A、B、C、D都不正确
[单选题]A.B.C.P(AB)=P(A)P(B)D.P(AB)≠P(A)P(B)E.A、B、C、D都不正确