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【单选题】
Public transit. In North America, public transportation has been the major casualty of the commitment to the automobile. Ridership on public transportation declined in the United States from 23 billion per year in the late 1940s to 7 billion in the early 1990s. At the end of World War I, U.S. cities had 50,000 kilometers of street railways and trolleys that carried 14 billion passengers a year, but only a few hundred kilometers of track remain. The number of U. S. and Canadian cities with trolley service declined from about fifty in 1950 to eight in the 1960s: Boston, Cleveland, New York, New Orleans, Philadelphia, Pittsburgh, San Francisco, and Toronto. Buses offered a more flexible service than trolleys, because they were not restricted to operating only on fixed tracks. General Motors acquired many of the privately owned streetcar companies and replaced the trolleys with buses that the company made. But bus ridership has declined from a peak of 11 billion riders per year in the late 1940s to 5 million in the 1990s. Commuter railroad service, like trolleys and buses, has also been drastically reduced in most U.S. cities. The one exception to the downward trend in public transportation in the United States is the subway, now known to transportation planners as fixed heavy rail. Cities such as Boston and Chicago have attracted new passengers through construction of new lines and modernization of existing service. Chicago has been a pioneer in the construction of heavy rail rapid transit lines in the median strip of expressways. Entirely new subway systems have been built in recent years in a number of U.S. cities, including Atlanta, Baltimore, Miami, San Francisco, and Washington, D.C. Public transportation is particularly suited to bringing a large number of people into a small area in a short period of time. Consequently, its use is increasingly confined in the United States to rush-hour commuting by workers in the central business district. A bus can accommodate thirty people in the amount of space occupied by one automobile, while a double-track rapid transit line can transport the same number of people as sixteen lanes of urban freeway. Despite modest recent successes, most public transportation systems are caught in a vicious circle, because fares do not cover operating costs. As patronage declines and expenses rise, the fares are increased, which drives away passengers and leads to service reductions and still higher fares. Public expenditures to subsidize construction and operating costs have increased, but public officials in the United States do not consider that public transportation is a vital utility deserving subsidy to the degree long assumed by European governments. In contrast, even in the relatively developed Western European countries and Japan, where automobile ownership rates are high, extensive networks of bus, tram, and subway lines have been maintained, and funds for new construction have been provided in recent years. Since the late 1960s, London has opened 27 kilometers of subways, including two new lines, plus 18 kilometers in light rail transit lines to serve the docklands area. During the same period, Paris has built 65 kilometers of new subway lines, including a new system, known as the Reseau Express Regional (R. E. R.) to serve outer suburbs. Smaller cities have shared the construction boom. In France alone, new subway lines have been built since the 1970s in Lille, Lyon, and Marseille, and hundreds of kilometers of entirely new tracks have been laid between the country's major cities to operate a high-speed train known as the TGV. Which of the following is NOT true of the public transportation systems in the developed countries?
A.
Commuter railroad service, trolleys and buses have been reduced in the U. S.
B.
Subways have largely been maintained.
C.
Fares usually can not cover operating costs.
D.
U.S. officials think it worthwhile to subsidize public transportation.
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【单选题】出生后3个月内小儿应接种的疫苗是
A.
卡介苗
B.
百、白、破三联疫苗
C.
乙肝疫苗
D.
脊髓灰质炎疫苗
E.
麻疹减毒活疫苗
【单选题】下列各项中,不属于“自然界的复杂环境”的一项是( )
A.
没有平整坚硬的路。
B.
有许多空间障碍,像树木、石块之类。
C.
有许多垂直障碍,像山崖、绝壁等。
D.
有大批建筑和各种车辆。
【简答题】(案例)某男性患者,18岁,因意识障碍2 h入院。既往体健,有大量饮酒史。同食者无此症状。体格检查:BP 130/76 mmHg。意识障碍。口唇无发绀,呼出气体有乙醇味。双肺呼吸音粗,无啰音。心率120次/min,律齐,各瓣膜听诊区未闻及杂音。腹部查体未见异常。双下肢无水肿。 患者入院后初步诊断为急性乙醇中毒,以下描述正确的是A.人饮酒的中毒剂量个体差异较大 B.血液中乙醇的致死浓度个体差异很大 ...
【单选题】关于ARDS病人呼吸变化的描述,错误的是
A.
初期呼吸困难,呼吸频率加快,呼吸时有窘迫感
B.
初期一般性给氧不能缓解病情
C.
进展期呼吸困难加重,同时出现发绀
D.
末期出现深度昏迷,呼吸困难,缺氧反而减轻
E.
末期可致深度酸中毒,心率失常
【单选题】样板图创建的文件在完成绘图后需要清理不用的信息,比如图块、图层等,需要执行的命令为()
A.
erase
B.
xref
C.
purge
D.
delete
【单选题】出生后 3 个月以上小儿应接种的疫苗是
A.
卡介苗
B.
百、白、破三联疫苗
C.
乙肝疫苗
D.
脊髓灰质炎疫苗
E.
麻疹减毒活疫苗
【单选题】婴儿,男,3个月,体重6kg。10月1日出生,出生后即接种了卡介苗和乙肝疫苗。母乳喂养,现婴儿看到人脸时会笑,听到声音会转头寻找,俯卧位时能抬头。该婴儿还应接种的疫苗是
A.
卡介苗复种
B.
乙肝疫苗第二针
C.
百白破三联疫苗
D.
乙型脑炎疫苗
E.
麻疹减毒活疫苗
【多选题】出生3个月应接种的疫苗是
A.
麻疹疫苗
B.
甲肝疫苗
C.
脊髓灰质炎疫苗
D.
百白破混合疫苗
E.
乙肝疫苗
【单选题】设某微机内存容量为1GB,若从0000H开始编址,则最后一个地址值为_______。
A.
FFFFFFFFH
B.
40000000H
C.
3FFFFFFFH
D.
FFFFFH
【多选题】一般要在任务委托书上记录( )等一些情况
A.
车辆外观
B.
车上设备
C.
物品
D.
油量
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