Methods 207 auto-mixed poly rubber impressions and 230 alginate impressions were fabricated for restorations to compare their accuracy.

方法：分别用自动混合型聚醚橡胶和藻酸钾印模材料制取修复体印模207例、230例，比较印模精确性。

youdao

Rubber poly v-belt is the new type transmission belt with a lot of ad-vantages.

多楔带作为一种新型的传动带，具有许多优点。

youdao