探讨了一种合成氧化镁晶须的新的工艺方法.This paper presents a new route to prepare magnesium oxide whiskers.简要分析了高纯氧化镁合成中的一些工艺原理.Some principles in preparing of high purity oxide are briefly discussed.大约80%的氧化镁产量来自菱镁矿.Magnesite deposits acc...
领款人必须在支票上背书。The payee of the cheque must endorse the cheque.这个男孩在讷讷的背书中出了很多差错.The boy made many blunders as he stumbled through his recitation.轮到我背书了.It was my turn to recite....