题目内容
（请给出正确答案）
The major source ofraw materials for synthetic rubber.
A) Hevea
B) Oil
C) Trees
D) Corn
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A) NR
B) SBS
C) SIS
D) NBR
A) NR
B) Butyl rubber (IIR)
C) Neoprene
D) EPR and EPDM
A) high-density polyethylene
B) nylon 6/6
C) fluorocarbons
D) polyester
A) Eliminate selection problems
B) Reduce raw materials costs
C) Adapt to environmental changes
D) Reduce processing
A) Thermal conductivity: metal ＜ plastics
B) Thermal expansion: metal ＞ plastics
C) Density: metal ＞ plastics
D) Thermal conductivity: metal ＞ plastics
A) casein
B) urea-formaldehyde
C) phenol-resorcinol-formaldehyde
D) poly (vinyl acetate)
A) Ability to adhere to the fibers
B) Higher stiffness compared with reinforcement
C) No significant chemical reaction between the two phases
D) Thermochemical compatibility between the fibers and matrix material
A) Accelerators and activators
B) Carbon black
C) Retarders
D) Antioxidants
A) Rayon
B) Polyacrylonitrile
C) Pitch
D) Pregreg
A) Reaction injection molding
B) Compression molding
C) Blow molding
D) Casting
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