皮皮学，免费搜题
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【单选题】
下列对于毛细血管的描述，不正确的是（  ）
A.
毛细血管的血管壁非常坚韧
B.
毛细血管是连通的动脉和最小的静脉之间的血管
C.
毛细血管内血流速度最为缓慢
D.
毛细血管的内径狭小，只允许红细胞单行通过
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【单选题】After Mrs. Brown put the letter in the envelope, she sealed it and put a stamp on it.
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