(Ⅰ)把C1的参数方程化为极坐标方程;
(Ⅱ)求C1与C2交点的极坐标(ρ≥0,0≤θ<2π).
The question of __________ English will keep on changing in the future is easy __________ since it is certain that this process will continue.
我国少数民族最多的省级行政区是 ( )
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《揠苗助长》这则寓言告诉我们什么道理?
如图为染色体与DNA的关系图.下列有关叙述错误的是( )