给定液体的表面上一段分界线的长度时L 其表面张力的大小和方向是？ Given the length L of a divi
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给定液体的表面上一段分界线的长度时L，其表面张力的大小和方向是？ Given the length L of a dividing line on the surface of a liquid, what is the magnitude and direction of the surface tension？
A.表面张力与L成正比，力与L垂直且沿液面的切线方向 The surface tension is proportional to L, and the force is perpendicular to L and along the tangent direction of the liquid surface
B.表面张力与L成正比，力与L垂直且与液面垂直指向液体内部. The surface tension is proportional to L, and the force is perpendicular to L and perpendicular to the liquid surface and points to the interior of the liquid.
C.The surface tension is proportional to L, and the force is perpendicular to L and
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表面张力与 l 成正比，力与 l 垂直且沿液面的切线方向；