【单选题】I find ____ impossible to learn two foreign languages well at the same time.
【单选题】I find it impossible for me _______ my old friends. This often makes me _____ sad.
【单选题】I find ___impossible to finish the task within the time given by the teacher.
【判断题】悬架的作用是将车架与车桥弹性地连接起来,悬架主要由弹性元件,震器组成,但不包括导向装置。
【单选题】随着迎角的变化,关于升力变化的规律描述错误的是
D.
升力系数综合表达了机翼形状、迎角等对飞机升力的影响