【单选题】空间一平面,其在V面、W面的投影积聚成一条直线并分别平行于OX轴、OY轴,则该平面为()
【简答题】设椭圆F: =1在(x,y)→(x′,y′)=(x+2y,y)对应的变换下变换成另一个图形F′,试求F′的解析式.
【单选题】头尾索引取值中,若不指定尾索引,则程序将如何取值?
【单选题】Tom, did it ever _______ to you that you would be punished for cheating on exams?
【判断题】由空间点向平面引垂线,垂足即该点在此平面上的正投影。
【判断题】由空间点向平面引垂线,垂足即该点在此平面上的正投影。
【单选题】Tom, did it ever ______ to you that you would be punished for cheating on exams?
【单选题】Tom, did it ever ______ to you that you would bepunished for cheating in exams?