问题
多选题
| 多选 |
| 如图所示，一简谐横波沿x轴向正方向传播，轴上M、N两点相距21m。t＝0时M点在平衡位置且向y轴负方向运动，N点为波谷；t＝0.5s时M点为波谷，则该波的（ ） |
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| A．波长可能是16.8m B．周期可能是0.4s C．波速可能是6m/s D．波速可能是5m/s |
答案
BC
搜题请搜索小程序“爱下问搜题”
| 多选 |
| 如图所示，一简谐横波沿x轴向正方向传播，轴上M、N两点相距21m。t＝0时M点在平衡位置且向y轴负方向运动，N点为波谷；t＝0.5s时M点为波谷，则该波的（ ） |
|
| A．波长可能是16.8m B．周期可能是0.4s C．波速可能是6m/s D．波速可能是5m/s |
BC
| 从对话后方框内的选项中选择适当的选项补全对话。 | |
| A: Good morning, Sue. Did you enjoy your holiday in the country? B: 1_____ And some friends went with us. A: 2_____ B: In a hotel. And we could enjoy the beautiful scenery from the window. A: Sounds good. 3_____ B: The sun shone nearly every day and it didn't rain at all. A: 4_____ B: Yes, they were great. We met some farmers and had some food in their houses. 5_____ Did you have a good weekend? A: Yes, but I didn't do much. I just stayed at home.
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