Most polymers are flammable in their pure form, except___（）
A. Polystyrene
B. Poly（vinyl chloride）
C. Polytetrafluoroethylene
D. Polyimide
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Natural rubber is a kind of（）
A. Thermoplastic polymers
B. Thermosetting polymers
C. Unsaturated polymers
D. Saturated polymers
The fundamental reactions involved in addition polymerization are ______（）
Addition to double bond and generation of a primary radical
B. Decomposition of initiator and transfer to initiator radicals
C. Initiation, propagation, transfer and termination
D. Initiation, propagation and termination
Usually，polymerization includes_, based on the mechanism involved in forming polymers（）
A. Chain growth polymerization
B. Condensation polymerization
C. Addition polymerization
D. Step growth polymerization
The repeating units on the copolymer chain may be arranged in various sequences along the backbone chain, including（）
A. Random copolymer
Block copolymer
C. Graft copolymer
D. Alternative copolymer
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