就是提示你已经定义过‘student’类型了，重复了
说明类名Student在其他地方被定义过了。
It’s also not uncommon to use a field to indicate type. This just makes searches a lot easier, but it’s up to your application to enforce what should and shouldn’t go into a collection. Schema-Less Database The “student” described earlier contains its own schema. Each record is ...
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For instance, in Windows®, each user who logs onto a particular computer is usually assigned her own separate My Documents folder and is prevented from reading and writing to other users' files, unless explicit provisions are made. Student users may be required to submit assignments into a ...
*P < 0.05, **P < 0.01, ***P < 0.001 by two-sided Fisher’s exact test (e), one-way ANOVA followed by Holm–Sidak’s test (b), two-tailed unpaired Student’s t-test (f, i, and m), or Two-way ANOVA followed by Sidak’s test (h and j). Source data are ...
32. By contrast, before ___(sign) the contract, this university student didn’t contact his parents but make contact ___ his new colleague. 相反,在签署合同之前,这个大学生没有联系他的父母而是联系了他的新同事。 33. He ___( permit) to practice the piano no more than one hour ___ day...
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Now open the Template.Model project node and delete the Student.cs and ExampleService.cs files; you don’t want to store Students, after all. What you do want to store are Speakers (and later Presentations, but I’ll leave that for refactoring later, just to see how well NakedObjects ...