试题与答案

对搭设高度超过()钢管脚手架应采取卸荷措施。 A.30m B.40m C.50m D

题型:单项选择题

题目:

对搭设高度超过()钢管脚手架应采取卸荷措施。

A.30m

B.40m

C.50m

D.60m

答案:

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参考答案:内模式或物理模式解析: 数据库系统在其内部具有三级模式及二级映射。三级模式分别是概念级模式、内部级模式与外部级摸式。概念模式是数据库系统中全局数据逻辑结构的描述,是全体用户(应用)公共数据...

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In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or non-personal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

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