当液面在毛细管中低于毛细管外液面时 液体在毛细管中的接触角为? When the liquid level in the
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当液面在毛细管中低于毛细管外液面时,液体在毛细管中的接触角为? When the liquid level in the capillary is lower than that outside the capillary, the contact angle of the liquid in the capillary is?
A.锐角 Acute angle
B.直角 right angle
C.钝角 Obtuse angle
D.0与π间 Between 0 and π

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B
