如图所示水下光源s�水面a点�射一束光线折射光线分别为ab两束则下列叙述正确的是 A在水中a光的速度比b光的小bab两束相 Template




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tomski如图所示水下光源s�水面a点�射一束光线折射光线分别为ab两束则下列叙述正确的是 a在水中a光的速度比b光的小bab两束相 coloring