问题 填空题

如果一个工人可管理多个设备,而一个设备只被一个工人管理,则实体”工人”与实体”设备”之间存在 【4】 关系。

答案

参考答案:一对多或1对多或1:M或1:N或1:n或1:m

解析: 实体之间的联系可以归结为三类:一对一的联系,一对多的联系,多对多的联系。设有两个实体集E1和E2,如果E2中的每一个实体与E1中的任意个实体(包括零个)有联系,而E1中的每一个实体最多与E2中的一个实体有联系,则称这样的联系为“从E2到E1的一对多的联系”,通常表示为“1:n的联系”。由此可见,工人和设备之间是一对多关系。

解答题
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Active New Zealand

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phone: 1-800-661-9073

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Adventure Life

Exceptional travel in Latin America and Antarctica

website: www.adventure-life.com

phone: 1-800-344-6118

Destinations: Antarctica, South America, Argentina, Chile, Peru, Ecuador, Bolivia, Central America, Belize, Costa Rica, Panama

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Adventure Spirit / Travel Network

Adventure tour operator + Travel agency

website: www.worldadventures.travel

phone: 800-492-0257

Destinations: Asia, Europe, South Pacific, Antarctica, Africa, South America, North America

Activities: Bicycling, Paddlesport, Snowsport, Hiking & Trekking, Caving, Family, Multisport, Cultural, Beach & Watersport, Scuba & Snorkeling, Nature, Photography, Safari, Geotourism, Fishing & Fishing Lodges, Sailing & Cruise, Other, Expedition Cruising, Space, Educational, Walking, Horseback/Dude Ranch, Self-Drive, Around the World Tours

65. Which of the following are NOT country names?

A. Argentina & Costa Rica                B. Bolivia & Chile

C. Peru & New Zealand                  D. Safari & Scuba

66. Which of the following statements is true according to the three advertisements?

A. If your are interested in history, you can click www.adventure-life.com for more information.

B. Both Travel Network and Adventure Life can take you to Africa.

C. If your want to enjoy Beach & Watersport, you can call 1-800-661-9073.

D. Active New Zealand can provide you adventure tours in New Zealand and Antarctica

67. If Jackson wants to travel around the world, he can call ___________.

A. 1-800-661-9073    B. 1-800-344-6118   C. 800-492-0257    D. none of the above