摘要
1. What are polar coordinates? I went from Chongqing to Beijing by air in 1992. When I came to the airport and watched big jetliners lumber into position on the runway for takeoff at the first time in my life, I asked questions to partner about how big jetliners got off at that position exactly. He made sure that
1. What are polar coordinates？
I went from Chongqing to Beijing by air in 1992. When I came to the airport and watched big jetliners lumber into position on the runway for takeoff at the first time in my life, I asked questions to partner about how big jetliners got off at that position exactly.
