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How
Animals Keep Warm{{/B}} Man has invented ways to keep warm, but how do animals defend themselves They cannot reason in the sense that man can, but nature has taken care of the animal kingdom by providing animals with special instincts. One of these instincts is known as hibernation. "Sleeping like a dormouse" is not only a common saying but is a reality. When winter comes, the dormouse and other hibernating animals have reached a well-nourished state. They eat very well in warmer days laying down fat in the tissues of their bodies and during hibernation this keeps them alive. Safe in their nests, or burrows, they sleep soundly until the warmth of spring arrives. Bats, tortoises, snakes, frogs, even insects like butterflies, hibernate more or less completely. Some, like the A. It moves about to keep warm. B. It grows thicker fur. C. It sleeps continuously. D. It goes to warmer areas. [单项选择]请说出防风的来源.主产地.药用部位.主要成分.鉴别特征及功效。防风的来源是（）
A. 蔷薇科 B. 豆科 C. 毛茛科 D. 伞形科 E. 百合科 F. 十字花科 [多项选择]建设项目策划是业主方管理的重要组成部分，在建设项目（）进行。
A. 实施期 B. 决策期 C. 运营期 D. 调整期 E. 检修期 [单选题] 合肥轨道交通五号线接触网导线距轨面的标准距离:珠江路停车场库内接触线悬挂点不低于 mm。( )
A.4000 B.4800 C.5500 D.5000 [多选题]目前我国定型生产的钢轨分类按力学性能分为普通轨、（ ）、耐磨轨。
A.A. 普通轨 B.B. 高强轨 C.C. 耐磨轨 D.D. 合金轨 [多选题]关于地下有限空间救援评估决策，下面描述正确的是( )。
A. 评估救援行动的可行性 B. 评估救援行动的安全性 C. 评估救援方法的合理性 D. 评估社会舆情的干涉性 [单选题]光纤中的衰减是由于材料吸收、材质不纯、波导的几何尺寸与（ ）等引起的信号功率的丢失。
A.散射 B.折射 C.反射 D.色散 [单项选择]损伤细胞膜 （）
A. 低浓度酚类 B. 高浓度酚类 C. 低浓度重金属盐类 D. 高浓度重金属盐类 E. 醇类 我来回答: 提交
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