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本报北京电(驻京记者程福俊)最近一个时期，南非连续发生我国公民遇袭身亡事件，仅9月18日后的5天内就有4人死亡，2人重伤。鉴于以上情况，我国驻南非使馆教育组和教育部昨天特别紧急提醒赴南非留学人员，要重
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在化学分析与环境监测的广阔领域里，精准的pH值测量是基础中的基础。多年的实验室工作经验告诉我，一个微小的pH偏差，都可能对实验结果产生重大影响。而氢氧化钙pH溶液标准物质，正是那把确保我们测量准确无误