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一、选择题 1、书放在桌面上,桌面会受到弹力的作用, 这个弹力产生的原因是 A.书的形变B.桌面的形变 C.书和桌面的形变D.书受到重力 2、共点的五个力平衡,则下列说法中不正确 的是 A.其中四个力的合力与第五个力等大反向 B.其中三个力的合力与其余两个力的合力 等大反向 C.五个
First, multiple-choice questions 1. The book is placed on the desktop and the desktop is subjected to the effect of elasticity. The reason for this elastic force is A. Deformation of the book B. Deformation of the desktop C. Deformation of the book and the desktop D. The book is subject to gravity 2 The five forces balance in the point is incorrect in the following arguments: A. Among them, the resultant force of the four forces is opposite to that of the fifth force. B. The resultant forces of the three forces and the resultant forces of the other two forces. Five to C.