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。
The furnace of coal gas calorific value high thoroughly dry distillation under section gas excluding, tar.
煤炭经炉内彻底干馏，煤气热值高，下段煤气不含焦油。
Tar sand oil was extracted from the Xinjiang tar sands and some kinds of asphalt products with special uses and higher value were prepared from the said oil.
以新疆小西沟、风城两种油砂为原料，利用甲苯抽提制取的油砂稠油研制开发高价值的特种沥青产品。
Tar sand oil was extracted from the Xinjiang tar sands and some kinds of asphalt products with special uses and higher value were prepared from the said oil.
以新疆小西沟、风城两种油砂为原料，利用甲苯抽提制取的油砂稠油研制开发高价值的特种沥青产品。
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