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男性，35岁，因腹痛、脓血便2个月来诊患者2个多月前出差回来后突然发热达38℃，无寒战，同时有腹痛、腹泻，大便每日10余次，为少量脓血便，伴里急后重，曾到附近医院化验大便有多数白细胞，口服几次庆大霉素和黄连素好转，以后虽间断服用黄连素，但仍有粘液性便，左下腹不适，自觉日渐乏力遂来诊，病后进食减少，体重似略有下降，具体未测，小便正常，睡眠尚可。既往体健，无慢性腹泻史，无药物过敏史，无疫区接触史。检体：T37.2℃,P86次/分，R20次/分，Bp120/80mmHg，无皮疹和出血点，浅表淋巴结未触及，巩膜不黄，咽(-)，心肺(-)，腹平软，左下腹轻压痛，无肌紧张和反跳痛，未触及肿块，肝脾未触及，腹水征(-)，肠鸣音稍活跃，下肢不肿。化验：血Hb129g/L,WBC11.4?109/L,N78%,L22%,plt210?109/L,大便常规为粘液脓性便，WBC20-30个/高倍，偶见成堆脓球，RBC3-5个/高倍，尿常规(-)
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计算题：对某一景观进行调查时，在景观中设置了20个样地进行调查两种景观要素A和B的相关性。结果为：A、B两种景观要素都有的样方数为6，有B景观要素无A景观要素的样方数为4，有A景观要素无B景观要素的样方数为5，A、B景观要素全无的样方数为5。试问景观中A、B两种景观要素是正关联性还是负关联？
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