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.论述了三丙酮胺纯度对加氢和还原胺化反应的影响.The effects of triacetoneamine concentration on hydrogenation and amination were discusse...
There was a short sharp shower followed by a strengthening breeze.一场短时强阵雨后风势渐长。Environmental pressures are strengthening the case for waterborne freight.环境的压力使人们更加认可水上运输。By strengthening the embankments they secured the ...
确保供应商收到并回签确认按订单要求交货.Make sure the supplier received and confirmed the order.请速告知你们是否可以按订单NC1. 46855做相同数量.Please advise if you can make the same quantities to put back into NC 1.46855....
I often bumped into him as he padded the corridors.他在走廊里轻轻地走过时，我常常碰见他。The corridors there were painted chocolate-brown to shoulder height.那里的走廊从地面到齐肩高的部分都漆成棕褐色。The corridors are carpeted in tartan.走廊里铺的是花格地毯。...