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<center>
<center>
<math>{B\Rightarrow \begin{cases}
<math>{B\Rightarrow \begin{cases}
C: \tau_{BC}^{\alpha}\times \eta_{BC}^{\beta}=0.3^1+{(1/5)}^2=0.012\\
C: \tau_{BC}^{\alpha}\times \eta_{BC}^{\beta}=0.3^1\times {(1/5)}^2=0.012\\
D: \tau_{BD}^{\alpha}\times \eta_{BD}^{\beta}=0.3^1+{(1/4)}^2=0.019
D: \tau_{BD}^{\alpha}\times \eta_{BD}^{\beta}=0.3^1 \times {(1/4)}^2=0.019
\end{cases}} </math>
\end{cases}} </math>
</center>
</center>