【单选题】下列关于炔烃和烯烃的叙述中,正确的是()。
A.
炔烃和烯烃由于都含有不饱和键,所以化学性质相同
D.
烯烃和炔烃的鉴别试剂是硝酸银或氯化亚铜的氨溶液
【多选题】在泰国旅游时应该注意的禁忌有( )。
B.
购买佛饰时,禁止说购买,必须说”求租、尊请“
【单选题】比较烯烃与炔烃的亲电加成反应的活性()。
【单选题】Stereotypes usually result from ______.
D.
knowledge and experience
【判断题】People’s stereotypes of certain group of people usually remain unchanged.
【判断题】Stereotypes are usually based on a visible characteristic such as a person's age, gender, or race.
【简答题】Many people say that negotiating behaviour varies for one culture to another. Americans, they say, is usually open, sociable and informal. For German negotiator, on the other hand, clarity and thoroug...
【判断题】Stereotypes are usually false.
【判断题】Stereotypes of men are usually more positive in societies than stereotypes of women.