问题
选择题
振源A带动细绳上各点上下做简谐运动，t=0时刻绳上形成的波形如图所示。规定绳上质点向上运动的方向为z轴的正方向，则P点的振动图像是
A.
B.
C.
D.
答案
答案：B
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振源A带动细绳上各点上下做简谐运动，t=0时刻绳上形成的波形如图所示。规定绳上质点向上运动的方向为z轴的正方向，则P点的振动图像是
A.
B.
C.
D.
答案：B
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| A: Where do you come from? B: I was born (出生) in Paris, but now I live here. A: 1________ B: No, I don't. I live in a small town outside New York. A: Are you a student? B: Yes, I am. A: 2________ B: Yes, I can. A: 3________ B: Yes, I am American. A: Do you speak English at home? B: No, we don't. 4________ But my father speaks English very well. My mother's mother tongue (母语) is French. 5________ A: How does your grandfather communicate (交流) with English-speaking people? B: We are all his interpreters (翻译).
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