题目内容

用基准物标定标准溶液时，先准确称取一定量的基准物，溶于水后再用标准溶液滴定至反应完全。

A. 对
B. 错

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如果待测样品的浓度超出标准曲线的浓度范围，就不能用分光光度法测定。

A. 对
B. 错

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 feel proud Because he has helped to make the park______

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在数据库的三级模式体系结构中，外模式与概念模式之间的映像，实现了数据库的【4】独立性。