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【题目】北京时间20164281540分,临川二中正在进行期中考试。依据所学知识回答下列各题。

1

A. 2016428940B. 2016428740

C. 20164272340D. 2016428540

2

A. 5/21 B. 3/29 C. 13/72 D. 7/75

【答案】

1B

2C

【解析】试题分析:

1】该题考查时间的计算,北京时间为东八区,时间为4281540分;求国际标准时间(0时区)的时间,根据区时的计算方法,东八区与0时区相差8小时,0时区在东八区的西边,时间应该减,因此4281540-8小时=428740分,答案选B项。

2】该题主要考查日期界限,全球来讲,经度越靠东时间越早,东12区时间最早的时区,根据东八区时间为20164281540分,求得东12时区的区时为20164281940分,所以全球最早的时间为20164281940分,说明现在进入28日的时间有1940分;那么还有4小时20分钟的时间在27日,因此用4小时20分除以24,就得出27日占全球的72分之13.答案选C项。


人为日界线

自然日界线

界线

原则上规定1800经线为日界线,但实际的日界线是曲折的,在地球表面是固定不变的

不固定,可以是任何一条经线

钟点

钟点不固定,从0—24

钟点固定,0点(或24点)

日期

日界线的东侧,为旧的一天,日界线的西侧,为新的一天

日界线的东侧为新的一天,日界线的西侧为旧的一天

观测角度

全球

局地

观测对象

时区图

光照图

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