常見例句雙語例句Ammonia, coal tar and coke are all by-products obtained in the manufacture of the coal gas.氨水，煤焦油和焦煤都是煤氣制造過程中產生的副產品。The structure of Yangzhou coal and products in co-processing of coal and tar were analysed by means of NMR and FTIR. Thestructural parameters were calculated.采用核磁共振和紅外光譜對克州煙煤及與煤焦油共處理產物進行了結構分析，并求算了其結構參數。 返回 coal-tar products