A:得出“与鸡蛋动静无关的”结论
B:得出“静止的鸡蛋更易破”的结论
C:在B处释放再重复做几次实验
D:分别在A,B,C处释放再重复做几次实验
阅读下列短文,从每小题的三个选项中选出最佳选项。
Hello, I'm Ann. This is my family. There are five people in my family. My grandparents are old. They are teachers. My father is tall. He has a white shirt. He is a fireman. He is not afraid of fire. He can help people. He likes his job. My mother is tall and beautiful. She has long hair. She has a yellow skirt. She is a nurse. I don't have any aunts. What about you?
在直角坐标系xOy中,曲线C1的参数方程为x=7cosαy=2+7sinα(其中α为参数),曲线C2:(x﹣1)2+y2=1,以坐标原点O为极点,x轴的正半轴为极轴建立极坐标系.
(Ⅰ)求曲线C1的普通方程和曲线C2的极坐标方程;
(Ⅱ)若射线θ=π6(ρ>0)与曲线C1,C2分别交于A,B两点,求|AB|.
2014年3月27日,广东“单独二孩”政策正式实施。该政策可缓解我省( )的问题。