皮皮学，免费搜题
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【单选题】
下列哪项属于前馈控制?
A.
激素在血液中维持一定浓度
B.
人体进入寒冷环境时，体温降低一段时间后体温回升
C.
小血管破损引起的出血几分钟后出血自行停止
D.
长期冬泳后，进入冷水中体温不降。
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