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Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.Now listen to the passage. The average number of women in each group is ______.
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TEXT A Before the mid-1860’s, the impact of the railroads in the United States was limited, in the sense that the tracks ended at this Missouri River, approximately the center of the country. At the point the trains turned their freight, mail, and passengers over to steamboats, wagons, and stagecoaches. This meant that wagon freighting, stagecoaching, and steamboating did not come to an end when the first train appeared; rather they became supplements or feeders. Each new "end-of-track" became a center for animal-drawn or waterborne transportation. The major effect of the railroad was }o shorten the distance that had to be covered by the older, slower, and more costly means. Wagon freighters continued operating throughout the 1870’s and 1880’s and into the 1890’s. Although over constantly shrinking routes, and coaches and wagons continued to crisscross the West wherever the rails had not yet been laid. The beginning of a major change was foreshadowed in the later 1860’s, when the Union Pacific Railroad at last began to build westward from the Centre Plains city of Omaha to meet the Central Pacific Railroad advancing eastward from California through the formidable barrier of the Sierra Nevada. Although President Abraham Lincoln signed the original Pacific Railroad bill in 1862 and a revised, financially much more generous version in 1864, little construction was completed until 1865 on the Central Pacific and 1866 on the Union Pacific. The primary reason was skepticism that a Railroad built through so challenging and thinly settled a stretch of desert, mountain, and semiarid plain could pay a profit. In the words of an economist, this was a case of "premature enterprise", where not only the cost of construction but also the very high risk deterred private investment. In discussing the Pacific Railroad bill, the chair of the congressional committee bluntly stated that without government subsidy no one would undertake so unpromising a venture; yet it was a national necessity to link East and West together. The author refers to the impact of railroads before the late 1860’s as "limited" because ______.
【问题3】 请指出图7-15可能存在的关键路径是什么 (请用英文字母序号列出)
【问题1】 通常，在该图书馆架构无线局域网(WLAN)的设计流程需要经过以下6个阶段：A．设备软硬件安装、调试B．确定无线局域网物理结构C．确定无线局域网逻辑结构D．进行需求分析和现场调研E．验收测试和维护F．进行设备产品的市场调研 根据网络开发设计的过程，给出上述6个阶段的先后排序： (1) 。
各级国有资产监督管理机构履行出资人职责的企业以非货币资产偿还债务，应当进行资产评估( )
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