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测定水样pH前不宜提前打开样品瓶塞,以防空气中的CO2溶入或样品中的CO2逸失。

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In “Dream World Cup”, the children drew the flags of some countries to______. A. to show t4. In “Dream World Cup”, the children drew the flags of some countries to______. A. to show their love for their owe country B. to tell the people their stories C. to show their good wishes for the football teams D. to show their new ideas about football

环境监测的目的就是准确、及时、全面、客观地反映环境质量和污染源的现状及其发展趋势,为污染源控制、环境评价、环境工程设计、环境管理、排污收费、环境规划、环境科学研究等提供科学依据。

路由器是工作在OSI参考模型第二层(数据链路层)的网络连接设备。

稻纵卷叶螟4-5龄幼虫食量占幼虫总食叶量的94%。

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