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六年级：圆柱形水桶，内直径4分米深5分米，47.1升水倒进桶......
六年级常考题，一个圆柱形水桶，桶的内直径是4分米，桶深5分米，现将47.1升水倒进桶里，水占水桶容积的百分之几？
六年级应用题专项117/181
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