\begin{document}$ e^+ e^- $\end{document} collisions are predicted. Their dependence on cos\begin{document}$ \theta_Z $\end{document} (cos\begin{document}$ \theta_W $\end{document}) are presented in four different polarization frames. Furthermore, the value of the angular distribution coefficients in different bins of cos\begin{document}$ \theta_Z $\end{document} are presented in the C-S frame. In comparison with the case at the hadron collider, better accurate measurement for Z(W) is expected because there is less background, and W could be reconstructed from its leptonic decay channel. This works provides a method to precisely test the electroweak production mechanism or some effect induced from new physics in the future measurements at the CEPC."> Angular distribution coefficients of <i>Z </i>(<i>W</i>) boson produced in <inline-formula><tex-math id="M6">\begin{document}${{e^+e^-}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/7cf49955-94b0-4e1b-9782-f85c580c83f6/CPC-2018-0450_M6.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/7cf49955-94b0-4e1b-9782-f85c580c83f6/CPC-2018-0450_M6.png"/></alternatives></inline-formula> collisions at <inline-formula><tex-math id="M7">\begin{document}${{\sqrt{s}=240}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/7cf49955-94b0-4e1b-9782-f85c580c83f6/CPC-2018-0450_M7.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/7cf49955-94b0-4e1b-9782-f85c580c83f6/CPC-2018-0450_M7.png"/></alternatives></inline-formula> GeV -
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