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Nowadays, all of the polymers are synthesized artificially.()
我国约有700个畜禽品种，约占世界的1／6。()
Silicon rubber also has many reactive points in the molecular chains, which is same as polyisoprene and polybutadiene.()
Number average molecular weights provide us some information related to ().
数量性状基因座即QLT。()
Additives are external substances purposely added to change properties of polymers or resins.()
微效多基因假说的实质是()。
An elastomer with great resistance to gas permeation can serve as inner tubes, gas hoses, tubing.()
Thermoset polymers are generally harder and stronger than thermoplastics and have better dimensional stability.()
关于遗传缺陷，正确的描述有()。
Which of the following property would thermoplastic elastomer have over natural rubber and synthetic rubber?()
Viscosity refers to the ability of a material to return to its original, initial size & shape once an external load or force is removed.()
The activity of a growing radical can be destroyed by reaction with ().
Which ones of the following are correct?()
人格是人的尊严、价值和道德品质的综合，即人品。这是哪个学科对人格的理解?()
