A:速度逐渐减小,当加速度减小到零时,速度达到最小值
B:速度逐渐增大,当加速度减小到零时,速度达到最大值
C:位移逐渐增大,当加速度减小到零时,位移将不再增大
D:位移逐渐减小,当加速度减小到零时,位移达到最小值
对图中的自然现象解释正确的是( )
根据句意和汉语注释,写出单词的正确形式。(1)Our English teacher has offered us some useful ____ (建议). I think it will help us a lot in our English study.(2)Here are two ____ (音乐会) tickets for you.(3)Daniel ____ (不愿) to accept my books ,which made me very sad.(4)____ (比较) this new TV set with the old one, you will see which is better.
已知a→=(1,2+sinx),b→=(2,cosx),c→=(-1,2),(a→-c→)∥b→,则锐角x等于( )