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Jackie2011

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wurongjun

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[img]http://latex.codecogs.com/gif.latex?$\{\left\{{\begin{array}{l}
\!b_0(t)=[1-s(t)]^2[1-\lambda s(t)],\\
\!b_1(t)=s(t)[1-s(t)][2+\lambda-\lambda s(t)],\\
\!b_2(t)=c(t)[1-c(t)][2+\mu-\mu c(t)],\\
\!b_3(t)=[1-c(t)]^2[1-\mu c(t)],
\end{array}} \right. \eqno(2.2)\}$[/img]

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