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当前学科:环境监测上岗考试
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测定水中苯胺类化合物的从(1—萘基)乙二胺偶氮分光光度法,适用范围在()mg/L至()mg/L。
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Write down the numbers of the topic sentences in the following passages.(1)When you throw a ball up into the air as fast as you can, the ball reaches a point where it seems to pause for a moment, and then it comes down. (2)When a bullet (子弹) is shot straight up, it will travel much faster and higher than a ball, but it, too, will come down. (3)Whatever goes up must come down.(4) We have always thought this to be true.(5) An airplane may climb to a height of seventeen miles and then travel far and long. (6)Yet it does not stay up forever.(7)Finally, like every-thing else, the plane must come down.
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