Natural rubber is a kind of .
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Natural rubber is a kind of .
A.Thermoplastic polymers
B.Thermosetting polymers
C.Saturated polymers
D.Unsaturated polymers
参考答案:
Natural rubber is a kind of .
A.Thermoplastic polymers
B.Thermosetting polymers
C.Saturated polymers
D.Unsaturated polymers
参考答案: