单选题
发布日期:2021-03-18
天文和历法
数学和水利
天文和数学
历法和数学
数学[英语:mathematics,源自古希腊语μάθημα(máthēma);经常被缩写为math或maths],是研究数量、结构、变化、空间以及信息等概念的一门学科。数学是人类对事物的抽象结构与模式进行严格描述、推导的一种通用手段,可以应用于现实世界的任何问题,所有的数学对象本质上都是人为定义的。从这个意义上,数学属于形式科学,而不是自然科学。不同的数学家和哲学家对数学的确切范围和定义有一系列的看法。在人类历史发展和社会生活中,数学发挥着不可替代的作用,同时也是学习和研究现代科学技术必不可少的基本工具。
历法,是为了配合人们日常生活的需要,根据天象而制订的计算时间方法。根据月球环绕地球运行所订的历法称为阴历;根据太阳在不同季节的位置变化所订的历法称为阳历。我国普遍存在的对历法的两种称谓:公历,农历(闰年有13个月,原因是其年月亮要绕地球13次才满一年)。从分类标准来说,阴历是和阳历对应的,再加上阴阳历,只有这三种历法。世界上任何一种历法也跳不出这三种历法的分类。世界上通行的“公历”(新历)实际上是一种阳历,而中国传统历法的“农历”(旧历)属于阴阳历。中国农历、印度历、犹太历是阴阳合历,一年有12或13个月;伊斯兰历是太阴历,一年只有12个月。辛亥革命之后,中国开始采用西方的公历,俗称“新历”,与中国旧有的历法相对。数千年来,我国先民创造了多种历法。据《历代长术辑要》《历法通志》《中国历法制度沿革史》三书记载,有名称可考的中国古代历法有115种。所有的历法,都需要有一个历元,作为标记时间的开
水利,汉语词语,拼音是shuǐ lì,意思是指对水力资源的开发和防止水灾。
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我国古代著名科学家沈括和郭守敬在下列哪些领域中作出了卓越贡献?()
我国古代著名科学家沈括和郭守敬在下列哪些领域中作出了卓越贡献?()
我国古代著名科学家沈括和郭守敬在下列哪些领域中作出了卓越贡献()
我国古代著名科学家沈括和郭守敬在下列哪些领域中作出了卓越贡献?()
我国古代著名科学家沈括和郭守敬在下列哪些领域中作出了卓越贡献?()
郭守敬是()朝代的科学家。
我国古代著名科学家沈括和郭守敬在下列哪些领域中做出了卓越贡献?()
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