Polyacrylonitrile is insoluble in acrylonitrile.聚丙烯腈不溶于丙烯腈.Water, acrylonitrile and the galactomannan gum are added to a reactor with an alkali metal hydroxide.水 、 丙烯晴和半乳甘露聚糖胶,同碱金属氢氧化物在一起,加入到反应器中.Objective: To observe th...
He worked in the news division of ABC — he was the anchor of its 15-minute evening newscast.他在美国广播公司的新闻部工作——他是晚间15分钟新闻播报的主持人。Foreign Newscast is on Page 16.国外新闻在第16版。An anchor coordinates a newscast in which several corr...