某同学在某砖墙前的高处水平抛出一石子,石子在空中的运动轨迹照片如图所示。从照片可看出石子恰好垂直打在一倾角为 30 0 的斜坡上的 A 点。已知每块砖的平均厚度为6cm ,抛出点到 A 点竖直方向刚好相距 30 块砖,求: ( 1 )石子在空中运动的时间 t ; ( 2 )石子水平抛出的速度 v 0 。
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【单选题】Which of the following word or phrase means“to talk to someone in a way which seems friendly but shows that you think they are not as intelligent as you”?
【单选题】Which of the following word or phrase means“to talk to someone in a way which seems friendly but shows that you think they are not as intelligent as you”?