material to be bonded. B.The weight,surface free energy,smell,and roughness of the material to be The wettability,surface free energy,polar groups,and roughness of the material to be bonded. D.The thickness,surface free energy,polar groups,and flatness of the material to be bonded. 30.Which statement about fiber loading is not correct? A.the amount of reinforcement in a composite materia B.is expressed in volume fraction C.a factor influencing the composite D.the strength of the composite is inversely proportional to the volume fraction of resent 31.Which feature is not associated with the compression molding technique? Producing parts with complex shapes and close tolerances; B.High part-to-part uniformity and reproducibilitv: c.Excellent control of fiber-to-resin ratios and low void content: D.Producing parts with constant cross-section shape in a continuous way 32.Directio ope rties in fiber posites are achieved mainlydue to fibe 0 entatio B.laminate plane C.interphase D.prepregs 33.Which composite fabrication technique can only use chopped fibers in their end-use products? A.Spay up, B.Filament winding. C.Resin Transfer Molding D.Pultru ion.E.Hand Layup 34.Which of the following composite fabrication techniques can only use continuous roving? A.Spay up B.Filament winding C.Resin Transfer Molding D.Hand Layup 35.In which of the following fiber orientations,a maximum of fiber loading in mposites can be achieved? A.unidirectional B.Bidirectional C.Multidirectional D.Random III.Choose a correet word or phrase according to the basic concepts and write it in the space provided.(15 pts) 1.Copolymers are classified into four subg Ds:1) 2) 3) according to the ordered degree of molecular arrangement. 2.According to mechanism the polymerization can be classified into 5) and 6) According to the matrix materials,composites are classified into 7) ;9y 4.10) is the ratio of the tensile strength of a fiber material to its weight density.5 material to be bonded. B. The weight, surface free energy, smell, and roughness of the material to be bonded. C. The wettability, surface free energy, polar groups, and roughness of the material to be bonded. D. The thickness, surface free energy, polar groups, and flatness of the material to be bonded. 30. Which statement about fiber loading is not correct? A. the amount of reinforcement in a composite material B. is expressed in volume fraction C. a factor influencing the composite D. the strength of the composite is inversely proportional to the volume fraction of fiber present 31. Which feature is not associated with the compression molding technique? A. Producing parts with complex shapes and close tolerances; B. High part-to-part uniformity and reproducibility; C. Excellent control of fiber-to-resin ratios and low void content; D. Producing parts with constant cross-section shape in a continuous way. 32. Directional properties in fiber composites are achieved mainly due to _________. A. fiber orientation B. laminate plane C. interphase D. prepregs 33. Which composite fabrication technique can only use chopped fibers in their end-use products? A. Spay up, B. Filament winding, C. Resin Transfer Molding, D. Pultrusion, E. Hand Layup 34. Which of the following composite fabrication techniques can only use continuous roving? A. Spay up B. Filament winding C. Resin Transfer Molding D. Hand Layup 35. In which of the following fiber orientations, a maximum of fiber loading in composites can be achieved? A. unidirectional B. Bidirectional C. Multidirectional D. Random III. Choose a correct word or phrase according to the basic concepts and write it in the space provided. (15 pts) 1. Copolymers are classified into four subgroups: 1) 2) ， 3) , 4) according to the ordered degree of molecular arrangement. 2. According to mechanism the polymerization can be classified into 5) , and 6) . 3. According to the matrix materials, composites are classified into 7) ; 8) ; 9) . 4. 10) is the ratio of the tensile strength of a fiber material to its weight density