(达州专版)2019中考物理第四单元密度压强浮力第12课时气体的压强流体压强和流速的关系复习课件.ppt

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第四单元 密度 压强 浮力,学生用书P46,第12课时 气体的压强 流体压强和流速的关系,重力,各个方向,变长,不变,不变,变小,不变,760,1.01105,10.3,减小,高,高,降低,升高,小,大,学生用书P46,高,不变,A,B,D,排尽筒内空气,密封注射器,刚被拉动,带刻度部分,9.5104,采用小活塞涂上凡士林或其他润滑油等,学生用书P47,B,B,B,B,B,C,C,B,反射,很低,上升,流速大压强小,大气压,小,21 000,7 000,A,A,D,【答案】 80克,

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