44.如图所示在水平地面上的a点以v1速度跟地面成θ角射出一弹丸恰好以v2的速度垂直穿入竖直壁上的小孔b下面说法正确的是 A.在b点以跟 Template




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tomski44.如图所示在水平地面上的a点以v1速度跟地面成θ角射出一弹丸恰好以v2的速度垂直穿入竖直壁上的小孔b下面说法正确的是 a.在b点以跟 coloring