填空题：Newton's second law says: the acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to its ________. (one word)?
填空题：Newton's second law says: the acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to its ________. (one word)?
发布时间：2026-01-27 14:03:28
