C:异丁烷转化为正丁烷的过程是一个放热过程
A:正丁烷分子储存的能量大于异丁烷分子
B:正丁烷的稳定性大于异丁烷
D:异丁烷分子中的碳氢键比正丁烷的多
I am Brad. I like scary movies and action movies. My favorite movie star is Jackie Chan. I think Jackie Chan is a great actor. He has a movie Who am I? It's a very successful action movie. It's exciting.
My name is Kelly. I am a girl. I like comedies and soap operas, but I don't like scary movies. I think they are scary. I think Beijing Opera is educational. On weekend, I often go to see it with my father. I can learn a lot about Chinese history.
I am Carlos. My favorite cartoon star is Mickey. I think Mickey Mouse is a great cartoon. I also like scary movies. I think they are very exciting.
I'm a girl. My name is Mary. On weekends, I often watch cartoons and talent shows on TV. I think they are wonderful and relaxing. I don't like sitcoms. They are boring.
根据表格内容,选择最佳答案。
列宁指出,商业“是我国经济生活的试金石,是无产阶级先头部队同农民结合的唯一可能的环节,是促使经济开始全面高涨的唯一的可能的纽带”。为此,苏维埃俄国调整了当时的经济政策,这一政策( )
以直角坐标系xOy的原点为极点,x轴的非负半轴为极轴,且两坐标系取相同的长度单位.已知曲线C1的参数方程为: {x=2cosθy=2sinθ (θ为参数),将曲线C1上每一点的纵坐标变为原来的 12 倍(横坐标不变),得到曲线C2,直线l的极坐标方程: 3ρcosθ+2ρsinθ+m=0 .
(Ⅰ)求曲线C2的参数方程;
(Ⅱ)若曲线C2上的点到直线l的最大距离为 27 ,求m的值.