【简答题】有一弹簧振子,振幅 A =2.0×10 -2 m,周期 T =1.0s,初相 φ =3π/4。其运动方程为 ,其速度的最大值为 。
【简答题】G = Guest, W = Waiter W: Good morning, sir. Do you have a———— ? G: No, I don’t. Is there any seat————now? W: Yes, there is. Would you like to sit in——,non smoking section or whatever comes open firs...