Natural rubber is a kind of（）
A. Thermoplastic polymers
B. Thermosetting polymers
C. Unsaturated polymers
D. Saturated polymers
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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
For the molecular weight distribution, which one of the followings is not correct（）
A. There is a considerable variation in molecular weight of polymers
B. The molecular weight distribution can be expressed by the ratio Mw/Mn
C. A polymer sample can be considered as a mixture of chains having different lengths
D. The molecular weights of polymers are usually uniform
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