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Member for
2 years 6 monthsAge: 9-12
Level: 三年级
Language: Chinese
(zh)
ID: 1413626
19/09/2021
Country code: MY
Country: Malaysia
Main content: 酸与碱 (2005321)
石蕊试纸的颜色变化,写出物质是酸性、碱性或中性。
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