硬锌使用过多反而促使PVC分解而产生黑点。

If zinc stearate is too much, it will decompose PVCor show some black points.

youdao

硬锌使用过多反而促使PVC分解而产生黑点。

If zinc stearate is too much, it will decompose PVCor show some black points.

youdao