Lecture 12: Alcohols, Ethers, Epoxides, Sulfides.
第十二堂：醇类，醚类，环氧化物，硫化物。
Due date: A week after Lecture 12 . Please note that you risk of an Incomplete if you miss the due date.
缴交期限：第十二次讲授后一周。请注意如果未按时缴交则将有课程未完成的风险。
There are 12 members with double accounts at Dollars Factory, we won't lecture anyone here, after all, the ones with more than one account know that's not allowed.
有12名成员有多帐号， 我们将不这里责骂任何人，终究，有多个账户的用户是不被允许的。
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