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一、单项选择题（每小题3分，共30分）1．有关重力的问题，说法正确的是［］A．重力的方向指向地心B．物体所受的重力就是所受的万有引力C．物体在地球上所受的重力是位置的函数D．物体在超重状态时，重力暂时增大2．有关弹力的问题，说法正确的是［］A．弹力大小总是与形变成
First, single-choice questions (3 points for each question, a total of 30 points) 1. Regarding gravity, the correct statement is []A. The direction of gravity points to the center of the earth. The gravity of an object is the gravitational force it receives. The gravity of an object on Earth is a function of position. When the object is in an overweight state, the gravity increases temporarily. Regarding the issue of elasticity, the correct statement is []A. Elasticity always changes shape