题型:名词解释 如图所示,一列简谐横波沿x轴正向传播,振幅为2cm,已知在t=0时刻相距30m的两个质点a、b的位移都是1cm,但运动方向相反,如图所示,其中a质点运动沿y轴负向;当t=2s时,b质点第一次回到y=1cm处,则( )A.t=0时刻,a、b两个质点的加速度相同B.a、b两个质点平衡位置间的距离为半波长的奇数倍C.此波的周期小于8sD.此波的波速可能为15m/s 查看答案
题型:名词解释 —How about going hiking this weekend?—Sorry, I prefer _____rather than _____.A.to stay at home, go out B.to go out, stay at home C.staying at home, go out D.going out, stay at home. 查看答案