A colon (:) after an option letter indicates that the option requires a value; for example, a -f option might be used to indicate a file name, as in the tar command.
选项字母后的冒号(：)表示该选项需要一个值；例如，- f选项可能用于表示文件名，tar命令中就是如此。
The process and control index of extracting xylenol from the by_product produced from coal tar processing is described. It has a high reference value.
叙述了从加工煤焦油产生的副产品中提取二甲酚的工艺及控制指标，具有很高的借鉴价值。
Further processing of coal pitch to raise the additive value is a key problem in coal tar processing.
对煤焦油沥青进行深加工以提高沥青产品的附加值是煤焦油加工中的一个重要问题。
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