adhesive. B)The adhesive must have surface energy lower than does the adherend have. C)The adhesive must have zero or very small contact angle D)The adhesive must not have cohesive forces. 7.Wood should be considered as a valuable engineering material because the raw materials are whereas those for most other materials are not. A)recycled B)cheap C)renewable D)limited 8.What adhesives can be used to bond structural components that will meet service conditions in southern deserts or in arctic regions? A)Phenolics B)Polyimides C)Fluorocarbons D)Polyurethane 0 is the most effective approach to making plastic more environmentally friendly A)Using biodegradable plastics B)Using photodegradable plastics C)Recycling plastics D)Burning plastics for volume reduction and/or energy 10. can be applied to thermoplastics only A)Reaction injection molding B)Compression molding C)Blow molding D)Casting 11.Which of the following substance is not used to produce carbon fibers? A)Rayon B)Polyacrylonitrile C)Pitch D)Pregreg 12. are(is)used to speed sulfur vulcanizing. A)Accelerators and activators B)Carbon black C)Retarders 第3而第 3 页 adhesive. B) The adhesive must have surface energy lower than does the adherend have. C) The adhesive must have zero or very small contact angle. D) The adhesive must not have cohesive forces. 7. Wood should be considered as a valuable engineering material because the raw materials are ________, whereas those for most other materials are not. A) recycled B) cheap C) renewable D) limited 8. What adhesives can be used to bond structural components that will meet service conditions in southern deserts or in arctic regions? A) Phenolics B) Polyimides C) Fluorocarbons D) Polyurethane 9. __________ is the most effective approach to making plastic more environmentally friendly. A) Using biodegradable plastics B) Using photodegradable plastics C) Recycling plastics D) Burning plastics for volume reduction and/or energy 10. _______________can be applied to thermoplastics only. A) Reaction injection molding B) Compression molding C) Blow molding D) Casting 11. Which of the following substance is not used to produce carbon fibers? A) Rayon B) Polyacrylonitrile C) Pitch D) Pregreg 12. _______________ are (is) used to speed sulfur vulcanizing. A) Accelerators and activators B) Carbon black C) Retarders