题干
______ is going to the north of Alaska to take another advantage there.
A：He is said that
B：It was said he
C：It is said that he
D：People said that he
答案(点此获取答案解析）
C
的斜面上某点先后将同一小球以不同的初速度水平抛出，小球均落在斜面上，当抛出的速度为V1时，小球到达斜面时速度方向与斜面的夹角为
；当抛出速度为V2时，小球到达斜面时速度方向与斜面的夹角为
，则（ ）
