在极坐标系内,方程ρ=5cosθ表示什么曲线?画出它的图形.
“他以孔子的继承人自居,从知识论的立场上批判地总结和吸收了诸子百家的理论主张,主张明确尊卑,以维护社会秩序。”上文中的“他”是( )
---I am going to take this summer holiday in Taiwan.
---Oh, really? Taiwan is ______ a beautiful island that ______ people in Guangdong go to visit it every year.