大工12春《工程力学》(二)在线作业2（In the spring of 12 Engineering Mechanics (two) online homework 2）.docVIP

大工12春《工程力学》(二)在线作业2（In the spring of 12 Engineering Mechanics (two) online homework 2） Engineering 12 spring Engineering Mechanics (two) online homework 2 1. the following statements about virtual work are incorrect. A. virtual work is the work of force on displacement that is independent of it The product of B. reactive force and displacement size The force displacement curve of C. virtual work is the diagonal line across the origin The force displacement curve of D. virtual work is a horizontal straight line parallel to the displacement axis The correct answer: C Full Score: 6 points: 6 The 2. displacement method takes () as the basic unknown quantity. A. support reaction B. independent node displacement Internal force of C. node D. or more is wrong The correct answer: B Full Score: 6 points: 6 3. replacing redundant constraints with the corresponding redundant unknowns, the method of converting statically indeterminate structures into statically determinate structures is called (). A. force method B. displacement method C. section method D. node method The correct answer: A Full Score: 6 points: 6 4. about the symmetry of internal forces, the following statement is correct (). A. axial force is antisymmetric force B. shear force is right facing C. bending moment is right facing force D. or more is wrong The correct answer: C Full Score: 6 points: 6 5. without considering the strain of materials, the geometry and location of the system do not change when subjected to arbitrary loads, and such systems are called (). A. geometric invariant system B. geometry variable system C. transient system D. or more is wrong The correct answer: A Full Score: 6 points: 6 6. what is incorrect in the following statements about the rigid nodes is (). A. rigid node can transfer bending moment At the end of the B., the relative rotation of the rod ends can occur No relative movement can occur at each end of the C. rigid joint D. rigid joint connection, the angle between the rods rema