氧气顶吹转炉炼钢脱碳反应的意义?

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问题:

氧气顶吹转炉炼钢脱碳反应的意义?

考点:炼钢工转炉炼钢工考试转炉炼钢工考试题库
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下列地理区域全部属于拉丁美洲的是

A.北美洲

B.南美洲

C.美国

D.美洲

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下列关于清朝的疆域的叙述中,不正确的是(  )

A.东到太平洋

B.南包南沙群岛

C.西抵葱岭和巴尔喀什湖

D.北至北冰洋

题型:问答题 论述题

完成下列光路图.

(1)在下图中画出光经凸透镜折射后的径迹

(2)在下图中画出光经凹透镜折射后的径迹.

(3)如图所示,S是发光点,S’是S在平面镜中的像,SL是射向平面镜的一条光线.请在图中画出平面镜的位置并画出SL的反射光线.

(4)完成下图的光路图.

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计算下面各题,能简便计算的要用简便方法计算.
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题型:问答题 论述题

Throughout the 19th century and into the 20th, citizens of the United States maintained a bias against big cities. Most lived on farms and in small towns and believed cities to be centres of (1) , crime, poverty and moral (2) Their distrust was caused, (3) , by a national ideology that (4) farming the greatest occupation and rural living (5) to urban living. This attitude (6) even as the number of urban dwellers increased and cities became an essential (7) of the national landscape. Gradually, economic reality overcame ideology. Thousands (8) the precarious (不稳定的) life on the farm for more secure and better paying jobs in the city. But when these people (9) from the countryside, they carried their fears and suspicions with them. These new urbanities, already convinced that cities were (10) with great problems, eagerly (11) the progressive reforms that promised to bring order out of the (12) of the city.

One of many reforms came (13) the area of public utilities. Water and sewerage systems were usually operated by (14) governments, but the gas and electric networks were privately owned. Reformers feared that the privately owned utility companies would (15) exorbitant (过渡的) rates for these essential services and (16) them only to people who could afford them. Some city and state governments responded by (17) the utility companies, but a number of cities began to supply these services themselves. (18) of these reforms argued that public ownership and regulation would (19) widespread access to these utilities and guarantee a (20) price.

(7)()

A.feature

B.peculiarity

C.quality

D.attribute

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