什么压力容器用钢要严格控制其含碳量?

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问题:

什么压力容器用钢要严格控制其含碳量?

考点:高级电焊工考试高级电焊工考试题库
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The effect of the baby boom on the schools helped to make possible a shift in thinking about the role of public education in the 1920’s. In the 1920’s, but especially (1) the Depression of the 1930’s, the United States experienced a (2) birth rate. Then with the prosperity (3) on by the Second World War and the economic boom that followed it, young people married and (4) households earlier and began to (5) larger families than had their (6) during the Depression. Birth rates rose to 102 per thousand in 1946, 106.2 in 1950, and 118 in 1955. (7) economics was probably the most important (8) , it is not the only explanation for the baby boom. The increased value placed (9) the idea of the family also helps to (10) this rise in birth rates. The baby boomers began streaming (11) the first grade by the mid-1940’s and became a (12) by 1950. The public school system suddenly found itself (13) The wartime economy meant that few new schools were buih between 1940 and 1945. (14) , large numbers of teachers left their profession during that period for better-paying jobs elsewhere.

(15) , in the 1950’s, the baby boom hit an antiquated and inadequate school system. Consequently, the custodial rhetoric of the 1930’s no longer made (16) ; keeping youths ages sixteen and older out of the labor market by keeping them in school could no longer be a high (17) for an institution unable to find space and staff to teach younger children. With the baby boom, the focus of educators (18) turned toward the lower grades and back to basic academic skills and (19) . The system no longer had much (20) in offering nontraditional, new, and extra services to older youths.

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假定土地资本化率为6%,建筑物资本化率为8%,土地价值为1000万元一建筑物价值为5000万元,房地产的综合资本化率应为( )。

A.7%

B.7.50%

C.7.67%

D.14%

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锅炉缺水是锅炉运行中最常见的事故之一,常常造成严重后果。严重缺水会使( )。

A.锅炉蒸发受热面管子过热变形甚至烧塌

B.锅水进入蒸汽管道和过热器,造成水击及过热器结垢

C.损坏过热器,影响用汽设备的安全运行

D.管子爆破,炉墙损坏

E.降低或丧失承载能力

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家庭是一个群体,它对消费者的购买行为产生巨大的影响。

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我国《医师法》规定,医师进行试验性临床医疗,应经医院批准,但无须征得病人本人或家属的同意。

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