汽油辛烷值与烃类组成的关系是()。A、含石蜡烃多的汽油,辛烷值高 B、含异构烷烃和芳 发布时间:2017-07-20 19:54 │ 来源:www.tikuol.com 题型:单项选择题 问题: 汽油辛烷值与烃类组成的关系是()。A、含石蜡烃多的汽油,辛烷值高B、含异构烷烃和芳香烃多的汽油,辛烷值高C、含正构烷烃多的汽油,辛烷值高D、以上均错误
题型:单项选择题 阅读短文,判断下列句子正(T)误(F)。 Tom is a very clever boy. He studies in Yucai School. He is tall and thin. But his classmate, Lili, is taller than him. Lili is active and beautiful. They all love their English teacher. They work hard. ( ) 1. Tom is taller than Lili. ( ) 2. Tom is very clever. ( ) 3. They don't love their English teacher. ( ) 4. Lili is active and beautiful. ( ) 5. Tom is fat and tall. 查看答案