问答题 在铁路工程项目的生命周期中，哪一阶段最为重要？为什么？

单项选择题 Tim says that he has a lot of favorite American movies, in particular, the movie “Avatar” because he likes science fiction movies a lot. “Avatar” was the most successful movie in history due to its computer graphics that created a new world on another planet.____

判断题 微藻中产量最大的是螺旋藻。