如图所示光�小球夹于竖直墙和装有铰链的薄板oa之间当薄板和墙之间的夹角α逐渐增大到90°的过程中则 A.小球对板的压力增大b.小球 Template




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tomski如图所示光�小球夹于竖直墙和装有铰链的薄板oa之间当薄板和墙之间的夹角α逐渐增大到90°的过程中则 a.小球对板的压力增大b.小球 coloring