两个相干点波源 S 1 和 S 2 ,它们的振动方程分别是 y 1 =Acos( t+π)和 y 2 =Acos( t)。 波从 S 1 传到 P 点经过的路程等于 2 个波长,波从 S 2 传到 P 点的路程等于2.5个波长。设两波波速相同,在传播过程中振幅不衰减,则两波传到 P 点的振动的合振幅为
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【简答题】The former lake bed is now a _____________ plain producing good crops of wheat. thrust overseas fertile split keen sustain grip reflect identify margin previous hesitate bud whichever slim glow
We also wondered if a different context would sway students' opinions and focus as Twitter users within a higher education classroom.
B.
A faint, sharp wind made the branches of the tree around the lake sway slightly, like enraptured concertgoers. Ramon and the rest of the family had retreated
C.
How would I describe former President Bill Clinton's golf sway ? Entertaining and dangerous. Let's start with the good stuff.
D.
…my knees and shuffle forward, but Sean sleeps on a water bed so I sway back and forth, then kind of topple into him. He looks down on…
E.
He also said that the boss' mood can sway wildly from day to day’? depending upon the success of SpaceX and his car company…