“半结晶”造句

PP是一种半结晶性材料.
PP is a semi crystalline material.

PBT是一种通过浓缩成型而制备的,一种半结晶热塑性塑料.
Polybutylene terephthalate ( PBT ) is a semicrystalline thermoplastic polymer formed by a condensation process.

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