Boron - substituted polyaromatic mesophase prepared by co - pyrolysis of a tar pitch with pyridine - borane complex under autogeneous pressure.以煤焦油沥青和吡啶硼烷为原料采用加压热缩聚工艺制备硼取代聚芳烃中间相沥青....
我有更坏的消息告诉你.I have even worse news for you.我还有更坏的事要说.I have worse to tell you.我说哩,恐怕这就是为什么星期一你的脾气比平常更坏的原因吧?I suppose that's why you're more than usually disagreeable on Monday....