【判断题】π 键是轴对称的,成键原子可绕 π 键键轴自由旋转。
【判断题】羧酸烃基上连的斥电子基团越多,酸性增强。
【简答题】Read and answer. (按照提示回答问题) 1. Is this a computer room?(肯定回答) __________________________________________ 2. How many computers are there in the room?(用8作答) __________________________________________ 3...
【简答题】Read and answer. (读句子,按要求回答问题) 1. Is this a garden?(肯定回答) ______________________________________________________________ 2. Are they sheep?(否定回答) ______________________________________________________...
【判断题】羧酸烃基上连的斥电子基团越多,酸性增强。