中科新闻网是一部内容开放、自由的互动网络百科全书客观、专业、权威的知识性百科全书
来源:百度文库 编辑:中科新闻网 时间:2024/05/22 01:06:01
I think 3 months is enough to study the surface staff, but it will take one or two years to get to the fundamental.