Meanwhile, several relational concepts are defined, and the full and necessary condition under which the standard FDs set becomes a minimum cover, and other problems are discussed.
同时，还定义了与它相关的几个概念，讨论了标准FD集f成为最小覆盖的充要条件及其它问题。
This paper presents that the sum of the value register of linear transformation and thenucleus is a full and necessary condition for direct sum, and from which five inductions are obtained.
给出了线性变换的值域与核的和是直和的充要条件，并由此得到五个推论。
The daily toil almost exhausted my whole body's strength, you want to make their full physical and emotional condition at all times, some of you ought to know the necessary knowledge.
每日的劳累几乎会耗尽我全身的力气，想要让自己的身体和情绪时刻保持饱满状态，有些必要的知识你就该知道。
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