填空题：高炉内碱金属的危害根源在于它们的（）。

题型：单项选择题

Passage Three

A rapid means of long-distance transportation became a necessity for the United States as settlement (新拓居地) spread ever farther westward. The early trains were impractical curiosities, and for a long time the railroad companies met with troublesome mechanical problems. The most serious ones were the construction of rails able to bear the load, and the development of a safe, effective stopping system. Once these were solved, the railroad was established as the best means of land transportation. By 1860 there were thousands of miles of railroads crossing the eastern mountain ranges and reaching westward to the Mississippi. There were also regional southern and western lines.
The high point in railroad building came with the construction of the first transcontinental system. In 1862 Congress authorized two western railroad companies to build lines from Nebraska westward and from California eastward to a meeting point, so as to complete a transcontinental crossing linking the Atlantic seaboard with the Pacific. The Government helped the railroads generously with money and land. Actual work on this project began four years later. The Central Pacific Company, starting from California, used Chinese labor, while the Union Pacific employed crews of Irish laborers. The two groups worked at remarkable speed, each trying to cover a greater distance than the other. In 1869 they met at a place called Promontory in what is now the state of Utah. Many visitors came there for the great occasion. There were joys all over the country, with parades and the ringing of church bells to honor the great achievement.
The railroad was very important in encouraging westward movement. It also helped build up industry and farming by moving raw materials and by distributing products rapidly to distant markets. In linking towns and people to one another it helped unify the United States.

The construction of the transcontinental railroad took ______.

A．4 years

B．3 years

C．7 years

D．9 years

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题型：单项选择题

急性心肌梗死

A．ST段弓背向上抬高
B．ST段弓背向下抬高
C．ST段呈水平型下移
D．ST段呈上斜型下移

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题型：判断题

要约是只能向特定的人发出的、邀请他人与自己订立合同的意思表示。 ( )

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题型：单项选择题

2012年3月，甲公司以其持有的一批库存商品交换乙公司生产的一台办公设备，并将换入的办公设备作为固定资产核算。有关资料如下：甲公司在资产置换日库存商品的公允价值为200万元，成本为230万元，已计提存货跌价准备40万元，增值税税额为34万元。乙公司用于交换的办公设备的账面余额为180万元，在交换日的公允价值为210万元，增值税税额为35.7万元。
甲公司向乙公司支付补价11.7万元，甲公司另支付换入办公设备运杂费和保险费2万元。甲公司和乙公司不存在任何关联方关系，且该交换具有商业实质。
要求：根据上述资料，不考虑其他因素，回答下列问题。

甲公司换入办公设备的入账价值是( )万元。

A．210
B．212
C．245.7
D．247.7

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题型：填空题

热量传递的三种方式是（）。

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高炉内碱金属的危害根源在于它们的（）。

题目：

答案：