下列物质在一定条件下能与水反应，且一定不属于水解反应的是
A．蛋白质
B．油脂
C．蔗糖
D．乙烯
答案：D
题目分析：乙烯只可与水发生加成反应，生成乙醇。
- Would you please help me ______, Wang Fei? This question is too hard for me.
- OK. Let me try.
A．after
B．up
C．Out
D．with
双馈异步发电机变频器由哪几部分组成？
