【单选题】( 3 分)下列各组物质中,实验式相同,但既不是同系物,又不是同分异构体的是( ) A .丙烯和丙烷 B .正戊烷和 2— 甲基丁烷 C .环己烷和苯 D .乙炔和苯
【简答题】根据句意和首字母提示完成单词 l. It was my first job after g . 2. -What's the opposite of the word ' cheap' ? -It's e . 3. Mr Zhou Enlai is a great man. We'll r him for ever. 4. -How about the concert? -Oh,it's w ! ...
【简答题】In order to earn money for his family, he ________ accept the erous job. 2. She _________ the radio to listen to a piece of easy music. 3. I was the first one to finish my test paper and the teach...
【简答题】My first job was at a local restaurant, where I worked for seven years . Being a waitress changed my 1 . I tried my best to do what I loved--- 2 People. I always made everyone , customers and coworker...
【简答题】在一次学生田径运动会上。参加男子跳高的15名运动员的成绩如下表所示: 成绩(m) 1.50 1.60 1.65 1.70 1.75 1.80 人数 1 2 4 3 3 2 这些运动员跳高成绩的中位数和众数是 (A)1.65,1.70 (B)1.70,1.70 (C)1.70,1.65(D)3,4