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碘量法是氧化还原滴定法中常用的方法之一。I2与 Na2S2O3的反应一般在和性溶液中进行。

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淀粉指示剂最好临用前配制,不能放置,放置过久会使淀粉变质失效。

A. 对
B. 错

Listen to a short passage concerning digital education and fill in the missing information.This is the VOA Special English Education Report.We _1 a question from a listener in the West Bank about how American schools use _2 technology. There is not a simple answer. It depends on the subject and level of students, of course.But it also depends on the interest and _3______ of the teachers, and the goals and budgets of the schools. Schools are almost all _4_ to the Internet. But some have more technology, and use it more, than others.For example, some schools use computers for 5_ like video conferencing, to bring the world into the classroom. And some classrooms _6______ things like a Smart Board, a kind of interactive whiteboard. Interactive whiteboards are large 7_ for presentations.They connect to a computer and can _8__ by touch. They can be used for documents or writing or to _9_ video. Some teachers are trying __10_ new ways to teach with devices like iPods and mobile phones. But educators say the most important thing, as always, is the _11_____.

离子钙测定的临床方法为法，总钙测定的参考方法为原子吸收分光光度法，WHO推荐的常规方法为，测定过程中常通过加入去除镁离子的干扰

血清磷的测定可以分为磷钼酸还原法和磷钼酸非还原法，前者的代表是法，后者的代表为法。