【单选题】恒沸精馏可用于________操作,萃取精馏可用于________操作。
【单选题】恒沸精馏可用于________操作,萃取精馏可用于________操作。
【多选题】入境旅游团中一游客希望购买几件古玩,是导游人员的正确处理方法。
A.
告诉游客古玩商店一般价格较高,可考虑在地摊上选购物美价廉的仿古艺术品
B.
如游客从私人手上购买古玩,应提醒游客鉴别真伪
【简答题】Mark Twain’s First Money Mark Twain was asked one day if he could remember the first money he ever earned. He thought a long time and then said , “Yes, it was at school.I can remember everything about...