【单选题】—Would you like to go to the supermarket? —___________.
【简答题】某化合物分子式为C 8 H 8 O 2 ,其核磁共振波谱如下图所示,试推断其结构并解释之。
【单选题】—I’m looking for a house. I’d like ____ with a big garden. —Yes, madam. We have several of this k
A.
20.—I’m looking for a house. I’d like ____ with a big garden. —Yes, madam. We have several of this kind. A.that
【简答题】分子式为C 9 H 12 的化合物,其 1 H NMR谱如下图所示,推断该化合物的结构。
【单选题】枪杀案后,尼克发现只有______站在盖茨比一边。
【单选题】Hello, everyone. I'd like to()to you our new secretary, Melinda Smith.
【单选题】G+C含量愈高Tm值愈高的原因是( )。