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【多选题】
关于人体血流的基本规律和特点，叙述正确的有（）。A.
稳流：流速与血管的横截面积成反比，如小静脉内血流
B.
非稳流：流速及随时间而变化，如动脉血流
C.
黏滞性：因黏滞作用，流体各处的速度出现差异，黏滞系数（η）表示黏滞性大小
D.
液流连续原理：流管粗处流速小，流流速大
E.
流体阻力：与血管半径（r）的四次方成反比
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