A:NO2+和 CO2
B:CO32- 和 SO2
C:O3和NO2-
D:SO42-和PO43-
(Ⅰ)说明C1是哪一种曲线,并将C1的方程化为极坐标方程;
(Ⅱ)直线C3的极坐标方程为θ=α0,其中α0满足tanα0=2,若曲线C1与C2的公共点都在C3上,求a.
要求:表格中所有信息必须使用,可适当发挥。
Family member
What's your favorite TV show?
Why do you like it best?
How often do you watch it?
When do you plan to watch it?
Father
action movies
exciting
twice a week
tomorrow
Mother
soap operas
moving
every day
tonight
Mei Mei
cartoons
funny
once a week
next weekend
Hello, my name is John. My families like different kinds of TV shows. My father……