题型:问答题 简答题 图甲所示为一列简谐横波在t=9s时刻的波形图,图乙是这列波中x=6m的P点的振动图象,下列说法正确的是( )A.该波向左传播B.经过7s时间,P点的路程为5cmC.经过7s时间,P点沿波传播的方向移动14mD.x=34m的质点与P点的振动速度方向相反 查看答案
题型:问答题 简答题 The ship, ___ 1500 passengers , set off on its first trip on a cold winter day.A. carried B, carrying C. to carry D. being carried 查看答案