时区（Time Zone）是地球上的区域使用同一个时间定义。1884年在华盛顿召开国际经度会议时，为了克服时间上的混乱，规定将全球划分为（）个时区

As you know, the turning of the earth makes the sun and the stars seem to move across the sky. Daylight, of course,【21】, when the sun rises in the east and when the sun is high【22】the sky, between these two positions, half of the daylight hours have been spent.

Therefore, by noticing【23】the sun stood in the sky, early man know they could tell the time of the day, At night the motion of the stars【24】the same purpose. The important thing in keeping time is to know the exact moment of【25】. For each of us, wherever we are, noon is when the sun is directly overhead. Think of an imaginary line【26】the sky, stretching from the north point of your horizon just to the south point.

When the sun cross your meridian (子午线), it is noon for you. When the sun still【27】of this line, or the meridian, it is morning. After the sun has crossed this line, it is【28】.

The Latin word for "midday" is "deridian",【29】which comes our word meridian. So AM is an abbreviation (缩写词) for "ante meridean", or before midday, and PM for after midday. Each or the world's time zones (时区) is about fifteen degrees wide in longitude (经度), which is about the distance the sun moves through tile sky in all hour.【30】lives in the same time zone observes noon at the same moment. In this way, the time is different by one hour as you move through each time zone.

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A．comes

B．begins

C．appears

D．shines

A.北京处于东8区，地方时间比0时区的时间早8小时

B. 北京处于东8区，地方时间比0时区的时间晚8小时

C. 北京处于西8区，地方时间比0时区的时间早8小时

D. 北京处于西8区，地方时间比0时区的时间晚8小时

A.12

B.24

C.360

A.返回系统当前时间戳对应的易读字符串表示

B.返回系统当前时间戳对应的structtime对象

C.返回系统当前时间戳对应的本地时间的structtime对象，本地之间经过时区转换

D.返回系统当前的时间戳

A.Region是地区，例如亚太区

B.DC是数据中心概念，例如北京、上海、西安数据中心

C.Zone是数据中心内的独立二层网络区域

D.Cluster是数据中心虚拟化网络隔离边界

A.北雁南飞，活跃在田间草际的昆虫也都

B.在地球上温带和亚热带区域里，年年如是

C.十四五岁的少年，恰如试飞的雏鹰，当有【目空一切】的豪情壮志

D.我们做事要光明磊落，不要【偷偷摸摸】的，让别人看不起

A.Zone的含义是可用性区，通常指一个机房(数据中心，IDC)

B.为了数据的安全和高可用性，一般会把数据的多个副本分布在多个Zone上

C.一个Zone包括若干物理服务器

D.每个Zone可以包含多个OceanBase副本

E.一个OceanBase集群，由若干个Zone组成

F.不同Zone一定要部署在不同机房

A.北雁南飞，活跃在田间草际的昆虫的叫声也都"销声匿迹

B.到处呈现一片"衰草连天"的景象，准备迎接风雪载途的寒冬

C.在地球上温带和亚热带区域里，年年如是，"周而复始

D.这样看来，"花香鸟语，草长莺飞"，都是大自然的语言。[来源

A.稀缺 一举多得

B.频繁 一举多得

C.稀少 一箭双雕

D.活跃 一箭双雕

A.Region主要指的是地理上位置的隔离

B. 可用区zone主要强调的是供电、网络、空调等基础设施的隔离

C. 存储节点指的是存储的物理设备

D. cluster只能部署在同一Region下的不同zone之间