单项选择题
A.高压聚乙烯 B.低压聚乙烯 C.聚丙烯
A.χ1=0.1 B.χ1=0.5 C.χ1=0.9
A.α=0.5 B.α=0.8 C.α=2
A.MI=0.1 B.MI=1 C.MI=10
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