将一毛细管端插入水中,毛细管中水面上升 5 cm ,若将毛细管向下移动,留了 3 cm 在水面,试问水在毛细管上端的行为是:
A.
毛细管上端溢出
B.
毛细管上端水面呈凸形弯月面
C.
毛细管上端水面呈凹形弯月面
D.
毛细管上端水面呈水平面
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