【判断题】对于脂肪醛酮来说,的活泼性表现在它可以H+的形式解离,并转移到羰基的氧上,形成烯醇式异构体。但是平衡点在酮式一边。
【单选题】She visited many places since last year.
【简答题】3. She has visited many places in China
______ she went there.A. for B. after C. before D. since
【判断题】.Net控件除了内置的服务器端控件外,还可以编写的用户控件,其扩展名为“.asax”。