一质点做斜上抛运动（忽略空气阻力），下列说法正确？
A. 法向加速度不变
B. 运动到最高点时，曲率半径最大，且运动物体速率是变化的
C. 切向加速度不变
D. 运动到最高点时，曲率半径最小，且运动物体速率是变化的
查看答案
The common structures of English new include:
A. beginning-body-summary structure
B. inverted-pyramid structure
C. pyramid-structure
D. inverted-pyramid structure and pyramid-structure
How does inverted-pyramid structure arrange information?
A. In ascending order of importance
B. In descending order of importance
C. In descending order of priority
D. In ascending order of priority
Which of the follow events will not be reported as hard news?
A. celebrity anecdote
B. foreign affairs
C. natural disaster
D. war
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