The delimitation of stands within ecotons generally gives on difficulties.在群落交错区范围内,通常划定群落片段的边界并不太困难.The matter of delimitation needs the two countries to negotiate. It can't be decided unilaterally.划界的事还需两国商量, 并不是任...
The piece goods are to be wrapped in kraft paper, then packed in wooden cases.布匹在装入木箱以前要用牛皮纸包好.Packing: kraft bag liner, carton or as each customer's requirements.包装: 牛皮纸复合袋, 纸箱或根据客户的具体要求.Optimum conditions of kraft...
Polyether diol mainly adopts polytetramethylene ether glycol ( PTMEG ).聚醚二醇主要采用聚四氢呋喃醚二醇 ( PTMEG ).Polyhexamethylene adipate diol and Polyurethane aquocmulsion based on the polyester are prepared.以己二酸、己二醇为原料合成聚己二酸己二醇酯二醇,并...