10.参考答案ABC说明分析A选。读取图像信息知波长为入甲=8m、Az=20m。B选。甲波的Q点运动至平衡位置所需时间为1s7则甲波周期为甲4.则甲波的速为經=2mC选,D不选。取t=0时刻x1=14m、x2=20m两个波峰点为基准点,二者相距6m。设t=0时刻两列波的波峰有相遇处,则该相遇处与两个波峰基准点的距离差为k甲一k2乙=6m(k1、k2均为整数),即k6+k2z_6+20k2=2.5k2+0.75,该方程式k1、k2无整数解组。则t=0时刻两列波波峰没有重合点。

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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