常見例句雙語例句Coal slack is one of industrial waste residues.煤矸石是我國排放量最大的工業(yè)廢渣之一。So the study on coal slack should be enhanced in order to make it become a sort of resources.加強對煤矸石利用的研究，以將其資源化。For silica fume and coal slack, the error value of measure by acid dissolution method is big and the reaction activity is lower.煤矸石和Ⅱ級磨細粉煤灰的火山灰活性比Ⅰ級分選粉煤灰較大； 酸溶法測定的煤矸石或硅灰的火山灰活性誤差較大，活性偏低；權威例句Natural gas, which emits 45% less carbon dioxide than coal, would take up most of the slack.FORBES: OutFront 返回 coal slack