简支梁的下部纵向受力钢筋，伸入支座的锚固长度对Ⅰ级钢筋不小于5d。

发布时间：2018-08-09 02:38 │ 来源：www.tikuol.com

题型：判断题

问题：

简支梁的下部纵向受力钢筋，伸入支座的锚固长度对Ⅰ级钢筋不小于5d。

考点：钢筋工考试中级钢筋工考试中级钢筋工考试题库

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灰霆是指空气中悬浮着大量极细微的干尘粒等颗粒物，能见度小于10km 的大气现象。2000 年以来，南京的灰霆天呈爆发式增长：2000 年112 天，2002 年147 天，2006 年152 天，2010 年灰霾天超过200 天。据此回答1～2题。

1．导致南京灰霆天逐年增多的主要原因是

①机动车增多，尾气排放量逐年增加 ②高楼增多，静风天数逐年增加 ③绿地面积增加，空气湿度逐年增大 ④南京的地形不利于污染物扩散 [ ]

A．①②

B．②③

C．①④

D．③④

2．为改善南京空气污染状况，应采取的有效措施有

①控制经济发展和人口增长 ②加大产业结构和能源消费结构的调整力度 ③完善环境空气质量监测与评价指标体系 ④扩大绿地面积，加强生态环境的建设 ⑤加强建筑工地扬尘管理，限制房地产开发 ⑥大力发展公交事业，禁止私人购买小汽车 [ ]

A．①②③

B．②③④

C．③④⑤

D．④⑤⑥

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The ocean bottom—a region nearly 2.5 times greater than the total land area of the Earth —is a vast frontier that even today is largely unexplored and uncharted. Until about a century ago, the deep-ocean floor was completely inaccessible, hidden beneath waters averaging over 3,600 meters deep. Totally without light and subjected to intense pressures hundreds of times greater than at the Earth’s surface, the deep-ocean bottom is a hostile environment to humans, in some ways as forbidding and remote as the void of outer space.
Although researchers have taken samples of deep-ocean rocks and sediments for over a century, the first detailed global investigation of the ocean bottom did not actually start until 1968, with the beginning of the National Science Foundation’s Deep Sea Drilling Project (DSDP). Using techniques first developed for the offshore oil and gas industry, the DSDP’s drill ship, the Glomar Challenger, was able to maintain a steady position on the ocean’s surface and drill in very deep waters, extracting samples of sediments and rock from the ocean floor.
The Glomar Challenger completed 96 voyages in a 15-year research program that ended in November 1983. During this time, the vessel logged 600,000 kilometers and took almost 20,000 core samples of seabed sediments and rocks at 624 drilling sites around the world. The Glomar Challenger’s core samples have allowed geologists to reconstruct what the planet looked like hundreds of millions of years ago and to calculate what it will probably look like millions of years in the future. Today, largely on the strength of evidence gathered during the Glomar Challenger’s voyages, nearly all earth scientists agree on the theories of plate tectonics and continental drift that explain many of the geological processes that shape the Earth.
The cores of sediment drilled by the Glomar Challenger have also yielded information critical to understanding the world’s past climates. Deep-ocean sediments provide a climatic record stretching back hundreds of millions of years, because they are largely isolated from the mechanical erosion and the intense chemical and biological activity that rapidly destroy much land-based evidence of past climates. This record has already provided insights into the patterns and causes of past climatic change—information that may be used to predict future climates.

The word "strength" underlined in Paragraph 3 is closest in meaning to______.

A．basis

B．purpose

C．discovery

D．endurance

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保护国家经济的顺利发展、保护人民的生命和生活环境的安全与健康，是出入境检验检疫的重要目的

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从明代开始（）就已成为宫廷和民间的中秋节必食佳品。

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在人们的方法体系中，最根本的方法是（）。

A.学习方法

B.工作方法

C.研究方法

D.思维方法

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