A.The two parts of resin and catalyst are mixed B.Squeezed into thin joints which block the oxygen C.The solvents evape rous adherends D.The hea source is removed 22. are stored with the resin and catalyst(or hardener)separated; when mixed the catalyst cause cross-linking of the resin. A.hot-melt adhesives, B.loss-of solvent adhesives C.anaerobic adhesives D.two-part mix adhesives used on soil,rock,and earth in construction A.Aramide B.Earth screens D.Styrofoams 24. are composites with a substance that is reinforced with nanometer size particles which enhance the substrates'physical properties A.Foam composites B.Laminar composites C.Nanocompo D.Sandwich co osites 25.In terms of modulus,which order(from low to high)is correct as far as glass, carbon,and Kevlar fibers are concerned? A.Kevlar fiber,glass fiber,graphite fiber B.Glass fiber,Kevlar fiber,graphite fiber C.Graphite fiber,glass fiber.Kevlar fiber 26.Which of the follow g describes is correet as for earbon and graphite fibers? Carbon fiber has a higher moc dulus than graphite fiber B.Graphite fiber has a lower content than carbon fiber. C.Carbon fiber has a higher pyrolyzinig temperature than graphite fiber. D.None of above. 27.Which statement is false concerning the objectives of applying coupling agent ont fiber? A.To protect the fiber surface from damage and bind fibers together for ease of processing. B.To lubricate the fibers for less abrasion during subsequent processing operations. To impart the mal and electric D To provide a ch between the fiber surface and the matrix and improve the bonding at the interface. 28.Choose the correct statement about the "wetting"phenomenon. A.A fiber can be properly wetted by a matrix only when the surface energy of matrix is greater than that of the fiber. B.A fiber can be prop etted by a matrix only when the surface energy of Is lower tha t that of the fiber C.A fiber can be properly wetted by a matrix only when the surface energy of matrix is equal to that of the fiber. D.It is nothing to do with surface energies of matrix and fiber. 29.Interface features are egarded as type of adhe esion phe and are ofter interpreted in terms of the e surfac ce structure of th bor ded material.Which are the major factors to be considered in explaining the adhesion phenomenon? A.The color,surface electric resistance,free radical groups,and roughness of the 4 A. The two parts of resin and catalyst are mixed B. Squeezed into thin joints which block the oxygen C. The solvents evaporate or penetrate porous adherends D. The heat source is removed 22. ______________are stored with the resin and catalyst (or hardener) separated; when mixed the catalyst cause cross-linking of the resin. A. hot-melt adhesives， B. loss-of solvent adhesives C. anaerobic adhesives， D. two-part mix adhesives. 23. The term for synthetic polymers used on soil, rock, and earth in construction. A. Aramide B. Earth screens C. Geosynthetics D. Styrofoams 24. ________are composites with a substance that is reinforced with nanometer size particles which enhance the substrates’ physical properties A. Foam composites B. Laminar composites C. Nanocomposites D. Sandwich composites 25. In terms of modulus, which order (from low to high) is correct as far as glass, carbon, and Kevlar fibers are concerned? A. Kevlar fiber, glass fiber, graphite fiber B. Glass fiber, Kevlar fiber, graphite fiber C. Graphite fiber, glass fiber, Kevlar fiber 26. Which of the following describes is correct as for carbon and graphite fibers? A. Carbon fiber has a higher modulus than graphite fiber B. Graphite fiber has a lower content than carbon fiber. C. Carbon fiber has a higher pyrolyzinig temperature than graphite fiber. D. None of above. 27. Which statement is false concerning the objectives of applying coupling agent onto fiber? A. To protect the fiber surface from damage and bind fibers together for ease of processing. B. To lubricate the fibers for less abrasion during subsequent processing operations. C. To impart thermal and electric conductivity. D. To provide a chemical link between the fiber surface and the matrix and improve the bonding at the interface. 28. Choose the correct statement about the "wetting" phenomenon. A. A fiber can be properly wetted by a matrix only when the surface energy of matrix is greater than that of the fiber. B. A fiber can be properly wetted by a matrix only when the surface energy of matrix is lower that that of the fiber. C. A fiber can be properly wetted by a matrix only when the surface energy of matrix is equal to that of the fiber. D. It is nothing to do with surface energies of matrix and fiber. 29. Interface features are regarded as a type of adhesion phenomenon and are often interpreted in terms of the surface structure of the bonded material. Which are the major factors to be considered in explaining the adhesion phenomenon? A. The color, surface electric resistance, free radical groups, and roughness of the