【简答题】He was in poor health, so the doctor forbade him ________(drink) wine.
【单选题】____________ he is poor, he is happy.
【判断题】如果发现火灾已晚,无法逃离火灾现场时,游客要设法自救。
【简答题】(15分)环丙沙星(G)是一种新型的广谱抗菌药物,其工艺合成路线如下: (1)反应②的反应类型为____________。物质C中最多可以有________个碳原子共平面。 (2) C转化为D,其实经历了先加成后消去两步反应,写出这两步反应的化学方程式: (3)给出下列物质的结构简式: A________________;B________________;F________________。 (...
【单选题】以环丙沙星为参照,采用模拟类推法,可以完成下列哪种药物的合成工艺路线设计( )
【单选题】The artist was born poor, poor he remained all his life.
【单选题】以诺氟沙星为参照,采用模拟类推法,可以完成下列哪种药物的合成工艺路线设计( )
【单选题】Although he is poor, ____ he is happy. [ ]
【单选题】于曲线 在 内的凹凸性描述正确的是( )