如图所示水下光源s�水面a点�射一束光线折射光线分成ab两束则 A.在水中a光的速度比b光的速度小 B.对于相同的障碍物b光更 Template




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tomski如图所示水下光源s�水面a点�射一束光线折射光线分成ab两束则 a.在水中a光的速度比b光的速度小 b.对于相同的障碍物b光更 coloring