15、在常见的三种力中，第一种是万有引力，万有引力与重力的关系是___ Of the three common forces, the first is Universal Gravitation, and the relationship between Universal Gravitation and Gravity is___

A.重力是万有引力中特殊的一种力，重力属于万有引力； Gravity is a special force in the Universal Gravitation, Gravity belongs to the Universal Gravitation;#B.重力就是万有引力，万有引力就是重力； Gravity is Universal Gravitation, and Universal Gravitation is Gravity;#C.重力不是万有引力，重力与万有引力是两种力； Gravity is not Universal Gravitation, Gravity and Universal Gravitation are two kinds of forces;#D.以上都不对； None of the above is true;