I know, the idea of an inert table pushing up on a book doesn’t seem very normal. Maybe it’ll help if you realize that gravity doesn’t pull you to Earth’s surface, as people often think—it pulls you to the center of the Earth. The normal force is what keeps you from plunging through the floor. (By the way, “normal” means perpendicular—it’s always perpendicular to the surface.)
AFP via Getty Images
。新收录的资料对此有专业解读
然而，即便“车—桩”问题逐步缓解，“网（电网）—储（储能）”仍是更为基础的变量。
22:31, 7 марта 2026Мир
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