如图所示为两列简谐横波在同一绳上传播在t=0时刻的波形图,已知甲波向左传,乙波向右传. 请根据图中信息判断以下说法正确的是:( )
E.x=0.2cm处的质点开始振动时的方向向+y方向F.两列波相遇时会发生干涉且x=0.5cm处为振动加强的点
Read and choose .选择恰当的翻译写在题前括号内。
Grandpa is her ___ father. a. father’s b. my c. she’s d. my sister’s
Come on. Let’s watch TV._______ a. Oh! b. Funny ! c. Great ! d. Cool!
What’s in your hand ? ________ a. Guess b. Nicec. Cool d. Great
How many girls can you see?_________ a. I can see fourteen girls b. There are fourteen girls c.I see fourteen girls d. I can see