单词：viscosity index
viscosity index的用法和样例：
例句
- Two kinds of product standards of OCP viscosity index improver constituted separately by SINOPEC and PetroChina in different ages are compared.对中国石化和中国石油两大集团公司在不同时代所制定的两个乙丙共聚物粘度指数改进剂产品标准做了比较说明。
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