预加工,初加工

重点介绍了木质纤维素转化为乙醇的原料预处理方法、纤维素和半纤维素的酶法降解、有效可靠的发酵菌种的选育及木质纤维素乙醇制备工艺的开发。

Cr8Ni9Ti─ZL0A双金属复合铸造工艺的研究

pretreating mantle

pretreating agent

pretreating agent【助剂】

pretreating of edges of leaves prior to binding

pretreating of edges of paper leaves, backs, signatures prior to binding

pretreating prior to binding

pretreating of edges of paper sheets prior to binding

pretreating (pre-treating)