- 12（自然数之一）_百度百科
12是介于11与13之间的自然数，属于偶数，因数包括1、2、3、4、6和12，具有过剩数、佩服数等数学特性，十二进制体系广泛应用于历法计算。
- 12 (number) - Wikipedia
There are twelve hours in a half day, numbered one to twelve for both the ante meridiem (a m ) and the post meridiem (p m ) 12:00 p m is midday or noon, and 12:00 a m is midnight
- 12 - 维基百科，自由的百科全书 - zh. wikipedia. org
地球 围绕 太阳 公转 的周期（1年；12个月），大约是 月球 绕地球公转周期的12倍（约1个月， 阴历 定 月 的基础），因此12这个数对人类的计时和 历法 具有特殊的意义。
- 12 - 維基百科，自由的百科全書
地球 圍繞 太陽 公轉 的週期（1年；12個月），大約是 月球 繞地球公轉週期的12倍（約1個月， 陰歷 定 月 的基礎），因此12這個數對人類的計時和 曆法 具有特殊的意義。
- 12 - Wikipedia
Twelve or 12 may refer to: 12 (number) December, the twelfth and final month of the year Dozen, a group of twelve
- 12 (number) - Simple English Wikipedia, the free encyclopedia
Mathematics Twelve is the first abundant number [1] Twelve is a composite number, meaning it is divisible by other numbers, not only 1 and itself In Roman numerals 12 is written as XII
- Number 12 - Meaning - Symbolism - Fun Facts - 12 in Religion and Myth
The number 12 reflects to the ancient meaning of 12 being the number of perfection The number 12 is the result of 4×3, 4 elements – 4 corners of the earth – 4 cardinal points
- What does 12 mean? - Definitions for 12
12 is a positive integer that follows 11 and precedes 13 It is also known as a dozen and is widely used for counting and measurement as it can be evenly divided into halves, thirds, fourths, sixths and twelfths
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