coke strength index

例句：

1. 1. The coke strength index is a crucial factor indetermining the quality of coal tar pitch.
   焦油强度指数是决定煤焦油沥青质量的关键因素。
2. 2. The coke strength indexvalue has been steadily increasing over the pastfew years.
   焦油强度指数值在过去几年里稳步上升。
3. 3. In order to improve thequality of coal tar pitch, it isnecessary to monitor the coke strength indexvalue.
   为了提高煤焦油沥青的质量，有必要监测焦油强度指数值。