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
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参考答案和解析
表面张力与 l 成正比，力与 l 垂直且沿液面的切线方向；
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对于给定液体表面上一段分界线长度是l，其表面张力的大小和方向是：（）A、表面张力大小与l成正比，力与分界线垂直且指向液体内部B、表面张力大小与l成反比，力与分界线垂直且指向液体内部C、表面张力大小与l成正比，力与分界线垂直且沿液面的切面方向D、表面张力大小与l成反比，力与分界线垂直且指向表面各个方向E、表面张力与l成正比，力与分界线垂直且与液面垂直指向液体外
对于给定液体表面上一段分界线为l，其表面张力大小和方向：（）A、表面张力与L成正比，力指向液体内部；B、表面张力与L成正比，力与L垂直且沿液面切线方向；C、表面张力与L成反比，力指向液面各个方向；D、表面张力与L成反比，力与L垂直且指向各个方向。
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