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产后6个月，月经周期缩短，经期正常，基础体温呈双相型，但上升缓慢，且黄体期(高温相)较短，本病例可能诊断是
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While conservatives today play a dominant role in mainstream politics, there was once a time when they were on the ____ of American political life.
The World Health Organization (WHO) was established in 1948, and one of its first responsibilities then was to_____ the separate international health-related treaties in a single code.
Because of over-hunting,the number of certain types of whales has been reduced so greatly that they are in danger of becoming____.
The senator,who was against the war, claimed that with all the _____and complex economic and political factors, the outcome of the war was still uncertain.
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