Cyclization occurs readily with dilute alkali.遇到稀碱就容易环化.Menthol was obtained from lemon eucalyptus oil via cyclization and catalytic hydrogenation.以柠檬桉叶油为主要原料经环化、催化氢化二步反应得到薄荷醇.METHODS Cilnidipine was synthesized from cin...
Mr. Wang Yubao is a well - known Tianjin Ditty singer.王毓宝先生是著名的天津时调表演艺术家.Used to tune folk songs, ditty, singing mainly in small places.所用曲调以民歌 、 小曲 、 地方小唱腔为主.The Chinese rice wine's brewing includes ditty fermentat...
他们看见15名警察骑着摩托车排成V字形前行。They saw a squadron of fifteen motorcycle policemen driving in V-formation.他们打着象征胜利的V字形手势。They were waving V-signs for victory.道路呈U字形蜿蜒曲折。The roads twist round hairpin bends....