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Notice: Undefined index: HTTPS in /www/wwwroot/mengmianren.com/wp-content/plugins/dessky-cache/dessky-cache.php on line 43 作平面运动两构件的瞬时相对转动中心;作平面运动两构件上瞬时相对速度为零的重合点;作平面运动两构件上瞬时绝对速度相等的重合点,即等速重合点 – 萌面人博客