While we listen to a conversation, a question and an answer form a unit which is called one ___1___. It usually centers around one ___2___. Generally speaking, questions are evenly ___3___ among topics, which means answers will show up when topics ___4___.
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What are the benefits of learning the conversation listening strategy?
A. Because it can help me predict the content and be mentally prepared.
Because I will now exactly where the answer is.
C. Because I would grasp the logic between the previous sentence and the next one.
D. Because I can seize the pace to do the exercise, i.e., when to move to the next question.
某瞬时一动点的法向加速度等于零,而其切向加速度不等于零,则该点作( )运动。
A. 直线运动
B. 该瞬时速度为零的曲线运动
C. 直线运动或该瞬时速度为零的曲线运动
D. 无法确定
作曲线运动的两个动点,初速度相同。运动轨迹相同、运动中两点的法向加速度也相同,则( )
A. 任一瞬时两动点的切向加速度必相同
B. 任一瞬时两动点的切向速度必相同
C. 两动点的运动方程必相同
D. 以上三项均相同。
点沿其轨迹的运动方程为s=b+ct，式中b、c为常数，则_____。
A. 点的轨迹必为直线
B. 点的轨迹必为曲线
C. 点做匀速率运动
D. 点的加速度必为零
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