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小明用电子秤、薄壁柱形容器(底面积为100cm2)、合金块、气球(质量忽略不计)、细线(质量和体积忽略不计)、水进行相关实验探究,它的操作步骤如图. ①将电子秤放在水平台上,测出合金的质量,如图a...
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