在均匀媒质中,各点的平衡位置在同一直线上,相邻两质点间的距离均为a,如图(a)所示,振动由质点1向右传播,质点1开始振动的速度方向竖直向上,经过时间t,前13个质点第一次形成如图(b)所示的波形,则该波的周期是 _________ ,波速为 ____________ 。 答案:t/2, 16a/t解析: 四川成都市2011届高三第二次诊断性考试英语试题 _______ winning Video of the Year, Lady Gaga also took home another seven prizes. A. Owing to B. Instead of C. In addition to D. According to