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利用天平测量物体密度的实验中，调节天平时，指针偏向分度盘的左边，应向 边调节平衡螺母使天平平衡；在左盘放入体积为30cm3的待测物体A，在右盘放入体积为10cm3的铁块B，此时指针向左偏，应向右...
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