题目内容
English writing instruction follows a fixed sequence.
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Writing is not a physical act, but it is a mental act.
When students are doing quick writing, they just let the ideas and words come out without concern for spelling, grammar, or punctuation.
将试样中有机物破坏,使磷元素游离出来,在酸性溶液中,用钒钼酸铵处理,生成黄色[(NH4)PO4NH4VO3﹒16MoO3]络合物,在波长420nm 下进行比色测定。()
比色时,待测液磷含量不宜过浓,最好控制在1ml含磷0.5mg以下。()
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