This unpleasant incident detracted from our enjoyment of the evening.这件不愉快的事情使我们当晚兴致大减.Compared with even die drawing, camber die - drawing's limit drawing coefficient is detracted, so efficiency is increased.曲面凹模拉深...
She waxes righteously indignant if anyone tries to contradict her.如果有人想反驳她,她说起话来就会义愤填膺.The moon waxes till it becomes full, and then wanes.月亮渐盈,直到正圆, 然后消亏.The moon waxes and wanes every month.月亮每个月都有圆缺....
The main gold bearing minerals include arsenopyrite, pyrrhotine, pyrite, galena and sphalerite.金矿的主要载金矿物分别为:毒砂 、 磁黄铁矿 、 黄铁矿 、 方铅矿和闪锌矿.Diethyldithiocarbamate was more better selective collector than Xanthate on galena.与黄药...
方法: 用溴代及胺化反应合成了四甲基吡嗪衍生物.METHODS: The target compound was prepared by the bromination and amination reaction.用溴—甲醇溶解Al_2O_3, 其回收率在91%以上.If Al 2 O 3 is dissolved by Br 2 - CH 3 OH, its Recovery rate is above 91 %.用溴比用氯时产出率...