题目内容 (请给出正确答案)
[主观题]

An elastomer with great resistance to gas permeation can serve as inner tubes, gas hoses, tubing, di

aphragms

A) NR

B) Butyl rubber (IIR)

C) Neoprene

D) EPR and EPDM

提问人:网友anonymity 发布时间:2022-01-06
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