Williamson reaction is one important method to prepare unsymmetric ether.Williamson反应是制备不对称醚类化合物的重要方法.Brydon's team-mate Martin Williamson consolidated his lead in the National League when he won the latest round.布赖...
从1996年开始, 尾矿已堆存到一露天矿坑里,坑内处置是在原矿开采后的场地重新堆放矿山废弃物.Since 1996, tailings have been deposited in a mined - out pit.所有货物仓库堆存,无覆盖. 装货前部分用双层草耙隔垫.B . All cargo inside warehouse without covering and partly dunnage with double straw...