试题与答案

下列轨道表示式能表示氧原子的最低能量状态的是 [ ] A. B. C. D.

题型:不定项选择题

题目:

下列轨道表示式能表示氧原子的最低能量状态的是 [ ]

A.

B.

C.

D.

答案:

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参考答案:实体解析: 实体完整性是保证隔开记录唯一的特性,即在一个表中不允许有重复的记录。在Visual FoxPro中利用主关键字或者候选关键字来保证表中的记录唯一,即保证实体完整性。在Visual FoxPro中将主...

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