中石油北京《工程力学(含模拟实验)》在线作业（PetroChina Beijing Engineering Mechanics (including simulation experiment) online homework）.docVIP

中石油北京《工程力学(含模拟实验)》在线作业（PetroChina Beijing Engineering Mechanics (including simulation experiment) online homework） PetroChina Beijing 13 spring Engineering Mechanics (including simulation experiments) online homework Simulated online job Multiple-choice question First questions What are the commonly used mechanical properties of materials? (s) A, electrical conductivity B, strength C and stiffness D, plasticity E, toughness Second questions Which of the following is the strength index of the material? (s) A and elastic modulus E B and yield limit sigma S C, strength limit sigma B D and the elongation. E, the contraction ratio of section length Third questions Which of the following is the stiffness index of the material? (Dan Xuan) A and elastic modulus E B and yield limit sigma S C, strength limit sigma B D and the elongation. E, the contraction ratio of section length Fourth questions Which of the following is the plastic index of the material? (s) A and elastic modulus E B and yield limit sigma S C, strength limit sigma B D and the elongation. E, the contraction ratio of section length Fifth questions What is the physical meaning of impact toughness? (Dan Xuan) A and the energy absorbed by the section in the fracture process B and the energy absorbed per unit area of the sample during fracture C, the average impact force of a sample in the course of impact D, the maximum impact force of the specimen in the course of impact E, the maximum deformation produced by the specimen during impact Sixth questions What are the test machines that can be used for tensile and compressive failure tests? (s) A high frequency fatigue testing machine B and rotating pure bending fatigue testing machine C electronic universal testing machine D hydraulic universal material testing machine E mechanical universal material testing machine Seventh questions What are the three parts of a general tensile test? (s) A, load part B, work part C, transition part D, gripping part E, record part