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背景资料某机电设备安装公司承建该市一新建住宅小区机电安装工程，工程内容包括：高层建筑给排水管道安装、热水管道安装、采暖管道安装、输气管道安装等。管道安装完成后，该安装公司对管线和设备进行了相应的压力、严密性试验以及防腐施工，验收合格后进行绝热层施工。施工中发生以下事件：事件一，施工中，由于缺乏监管，工人采用普通铁丝对保温层进行捆扎，每节管壳只捆扎了一道。事件二，工程中部分管道使用金属保护层，在垂直管道施工时按管道坡向自上而下进行施工。问题 2012年7月，计算机中心空调水管上的平衡调节阀出现故障，3～5层计算机中心机房不制冷，建设单位通知A施工单位进行维修，A施工单位承担了维修任务，更换了平衡调节阀，但以保修期满为由，要求建设单位承担维修费用。问题平衡调节阀系统安装前应做什么试验

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球罐充水试验，各支柱上应按规定焊接______的水平测定板。

A. 临时性
B. 永久性
C. 验收期
D. 观测期

Directions: This part consists of a short passage. In this passage, there are altogether 10 mistakes, one in each numbered line. You may have to change a word, add a word or delete a word. Mark out the mistakes and put the corrections in the blanks provided. If you change a word, cross it out and write the correct word in the corresponding blank. If you add a word, put an insertion mark (Λ) in the right place and write the missing word in the blank. If you delete a word, cross it out and put a slash (/) in the blank. When does history begin It is tempting to reply "in the beginning", butlike many obvious answers, this is turned out to be unhelpful soon. As a 67. great Swiss historian once points out in another connection, history is the 68. one subject where you cannot begin at the beginning. If we want to, wecan trace the chain of human descent back to the appear of vertebrates 69. (脊椎动物), or even to the photosynthetic (光合的) cells which lie atthe start of life itself. We can go back further still, to almost unimaginably 70. upheavals (剧变) which formed this planet and even to the origins ofuniverse. Yet this is not "history". 71. Commonsense helps here: history is the story of mankind, what it has 72. done, suffered or enjoyed. We all know that dogs and cats do not havehistories, so human beings do. Even when historians write about a natural 73. process beyond human control, such as the ups and down of climate, or 74. the spread of disease, they do so only because it helps us to understandwhy men and women have lived (and died) in some ways rather thanothers. This suggests that all what we have to do is to identify the 75. moment which the first human beings step out from the shadows of the 76. remote past.

Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre. You may not use any of the words in the bank more than once. The traditional American Thanksgiving Day celebration goes back to 1621. In that year a special feast was prepared in Plymouth, Massachusetts. The colonists who had 1 there had left England because they felt denied of 2 freedom. They came to the new land and faced difficulties in coming across the ocean. The ship which carried them was called Mayflower. The North Atlantic was difficult to travel. There were bad storms. They were assisted in 3 to live in the new land by the Indians who inhabited the region. The Puritans, as they were, had much to be 4 for. Their religious practices were no longer a 5 of criticism by the government. They learned to 6 their farming habits to the climate and soil. When they selected the 4th Thursday of November 7 their Thanksgiving celebration, they invited their neighbors, the Indians, to join them in dinner and a prayer of 8 for the new life. They recalled the group of 102 men, women and children who left England. And they remembered the dead who did not live to see the 9 of Massachusetts. They reflected 10 the 65 days’ journey which tested their strength. A. thankful I) source B. have J) attempt C. on K) for D. learning L) congratulant E. bank M) adjust F. settled N) shores G. gratitude O) religious H) to

临床上使用的磨光粉颗粒粗的是

A．60目左右
B．70目左右
C．80目左右
D．90目左右