• 在棱长为a的正方体ABCD-A1B1C1D1中,D1到B1C的距离为 :middle;" src="http://tikucommon-zs.oss-cn-beijing.aliyuncs.com/tiku/source/image/12320/swd00646461.gif"> .试题及答案-填空题-云返教育

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      在棱长为a的正方体ABCD-A1B1C1D1中,D1到B1C的距离为         :middle;" src='http://tikucommon-zs.oss-cn-beijing.aliyuncs.com/tiku/source/image/12320/swd00646461.gif'>

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