If Z is represented by the decimal 0. W7, what is the digit W?
B.a diminishing marginal rate of substitution.
C.an increasing marginal rate of substitution.
D.an indifference curve effect.
A、Covalent bond
B、Metallic bonding
C、Ionic bonding
D、Hydrogen bond
A、basal lanina
B、basal layer
C、dermis
D、keratinocyte layer
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 joyous celebrations 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 major problems with America's railroad system in the mid 19th century lay in ______.
A.poor quality rails and unreliable stopping systems
B.lack of financial support for development
C.limited railroad lines
D.lack of a transcontinental railroad
为了保护您的账号安全,请在“简答题”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!