多項選擇題Among following methods, which can be used to measure crystallinity of polymers()。

A.Density method
B.WAXD
C.DSC
D.IR


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1.單項選擇題Among following four polymers, which is the most rigid()。

A.poly (dimethyle siloxane)
B.polyacrylonitrile
C.polystyrene
D.polyethylene