题目内容
有价证券是以记名的方式认定持证人有权取得收入的凭证。( )
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EDTA与金属离子的络合比较复杂。
When Tom left sch001．he did not really know what he wanted to do．He first worked in an office．but he found that it was boring．There was also the trouble with his second job in a carfactory. He then decided to work out of doors, and got a job as a gardener in a park. Now he works much harder than he did in the office or in the factory, because his work is more varied. He works the hardest in autumn and winter, keeping the park tidy and preparing forspring and summer. In summer he can relax and he can feel proud that he has helped to make thepark so beautiful. Many people visit the park and he is always pleased when he hears them sayhow lovely it looks. Why does he work much harder than he did in the office or in the factory Because his work is______
比耳定律说的是溶液对光的吸收程度与溶液的浓度成正比而与液层的厚度无关。
在重量法测定硫酸根实验中，硫酸钡沉淀是非晶形沉淀。
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