【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. ...
【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】根据句意和首字母提示填空,完成下列句子。 1. The car is worth m_______ of dollars. 2. His uncle is carrying out a r_______ on the cause of cancer. 3. Don't draw on the p_______ walls. 4. You don't understand me in the s__...
【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】在VB.NET中整型变量的类型符是 。 答案一:$ 答案二:! 答案三:# 答案四:%A. 答案一B. 答案二C. 答案三D. 答案四
【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】After inventing dynamites, Swedish-born Alfred Nobel became a very rich man. However, he foresaw its universally destructive powers too late. Nobel preferred not to be remembered as the inventor of dy...
【单选题】下列各项中,结账时,属于应当划通栏双红线的是( )。