【简答题】质量为 的小球与轻弹簧组成的系统,按 的规律作谐振动,求: (1)振动的周期、振幅和初位相及速度与加速度的最大值; (2)最大的回复力、振动能量、平均动能和平均势能,在哪些位置上动能与势能相等? (3) 与 两个时刻的位相差;
【简答题】用所给单词的正确形式填空 。 1. The Blacks would like to stay in an (expensive) hotel to save money. 2. They are going to an (excite) place. 3.I don't think it's a good idea to travel there. It's too (tour) there. ...
【简答题】用括号内所给词的适当形式填空。 1. We need _______ (peace) world. We hate wars. 2. Paris is one of the (live) cities in Europe. 3. I'd like to go somewhere (relax). 4. Why not (consider) visiting Singapore? 5...
【单选题】下列各选项中,属于在结账时,应当划通栏双红线的是()。
【简答题】从A,B,C,D四个选项中选出与划线部分意义相同或相近的选项。 1. He was too tired and fell asleep soon. A. go to bed B. went to sleep C. went asleep D. got to asleep 2. Watch out! There is an iceberg ahead. A. Look out B. Take out...
【单选题】经络系统中,具有维持人体正常运动功能的是()。
【简答题】3 质量为 的小球与轻弹簧组成的系统,按 的规律作谐振动,求:(1)振动的周期、振幅和初位相及速度与加速度的最大值;(2)最大的回复力、振动能量、平均动能和平均势能,在哪些位置上动能与势能相等?(3) 与 两个时刻的位相差;
【简答题】根据光子理论 。则光的速度为 答案1: 答案2: 答案3: 答案4:A. 答案1B. 答案2C. 答案3D. 答案4
【单选题】下列各项中,结账时,属于应当划通栏双红线的是( )。