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This paper introduces the preparing method, the structure, the properties and applications of poly (trimethylene terephthalate) (PTT), and it compared with PET, PBT et al. engineering plastics.

本绍聚对苯二甲酸丙二醇酯(PTT)的制法、结构、性能及应用,并和PET、PBT等工程塑料比较。

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Diagnosis of hemophilia A and B usually starts with lab tests including a platelet count which is usually normal, a prothrombin (PT) time, and a partial thromboplastic (PTT) time.

友病A和B的诊断通行实验检测，包括小板计数（一正）、凝原时间（PT），以及部分凝时间（PTT）。

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There is also a prolonged prothrombin (or PT) time, as well as prolonged partial thromboplastin time (or PTT), both of which reflect having lower levels of circulating coagulation factors.

凝原（PT）时间和部分凝（PTT）时间均会延长，两者都反映出液循环中低水平的凝因子。

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