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如图所示，系统置于正以【图片】的加速度上升的升降机内，两质量均为【图片】的【图片】两物体，【图片】所在的桌面是水平的，绳子和定滑轮质量均不计，若忽略滑轮轴上和桌面上的摩擦，且不计空气阻力，则绳中张力为【图片】(【图片】)。 【图片】
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A.
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B.
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C.
gather
D.
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