scrap material短语¹³¹⁶²⁰⁺³ 基本例句 废料 The study up on making the fly ash active by all kinds of methods. In order to improve the strength of the fly ash products. In the hope of reaching the effective use of industry scrap material. 探讨了以各种方式激发粉煤灰活性的方法，提高粉煤灰制品的强度，以期达到工业废弃物的有效利用。 chemyq