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【单选题】
测定水中F - 含量时，加入总离子强度调节缓冲溶液，其中柠檬酸的作用是______。A.
控制溶液的pH在一定范围内；
B.
使溶液的离子强度保持一定值；
C.
掩蔽Al 3+ 、Fe 3+ 干扰离子；
D.
加快响应时间。
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【简答题】有毒动植物中毒是( )。
【单选题】E-mail—can't live with it, can't live without it. Con artists and real artists, advertisers and freedom fighters, lovers and sworn enemies-they've all flocked to email as they would to any new medium ...
A.
E-mail brings convenience as well as inconvenience.
B.
E-mail complicates our lives.
C.
E-mail links us to others more closely, but at the same time, it isolates us as well.
D.
E-mail draws crowds of people who can't live with or without it.
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