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在化学分析领域，标准物质的准确性和可靠性是确保分析结果一致性和可比性的基石。多年来的实践经验告诉我，正己烷中二硫化碳溶液作为一种重要的标准物质，在多个分析领域扮演着至关重要的角色。无论是环境监测、食品
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近日，清华大学恢复对社会公众开放暑期校园参观，时间从7月8日持续至8月6日，周一除外。开放日入校时间为9:00至11:00，14:00至16:00。校园参观实行网上实名预约，参观者从指定校门出入，预约
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