[单选题]
An ideal fluid flows at 12 m/s in a horizontazh3)wf0wy9 mbd5 d+lxp97vebwe j+zm du. 8 5ml pipe. If the p /3c38gtub8z/hw c)hzvz gdy07/jo bj ipe widens to twice its original radius, whath7jyb)ovj3gz3hgbw ut8/dc8/ zcz0/ is the flow speed in the wider section?
