| The next decade could see commuters
speeding to work at about 300 miles per hour aboard magnetic levitation
vehicles, according to a report by Argonne National Laboratories. But before
"maglev" vehicles can become commercial successes, the report says, people need
to stop thinking of them as high-speed trains. Instead, consider them
low-flying aircraft. Argonne contends that maglev vehicles will be best suited
to replace commuter aircraft. Plane flights under 600 miles are the least
energy-efficient, and maglev "planes" should cut these fuel needs by up to 75
percent. Reportedly, the money saved by a 2,000 mile maglev network linking
major cities world more than pay for its construction in 20 years. The quiet
purr of levitating crafts would also be a balm for neighborhoods tormented by
the roar of conventional takeoffs and landings. The technolog A. In 5 years. B. In 10 years. C. In 20 years. D. In more than 20 years. [单选题]单选题：车站在对外开通运营前,须制定本站的（ ）。
A.运营组织方案 B.客运组织方案 C.行车组织方案 D.票务组织方案 [单选题]环氧树脂自流平地面养护环境湿度宜为23℃±2℃,养护天数不应少于( )。5.4.1条
A.3d B. 7d C. 14d D. 28d [多选题]配电线路、设备故障紧急处理，系指配电线路、设备发生故障被迫紧急停止运行,（）的故障修复工作。
A.需短时间恢复供电 B.需短时间排除故障 C.连续进行 D.长时间 [单选题]焊条药皮的主要作用是（ ）。
A.稳定电弧作用 B.防止电弧偏吹作用 C.减小焊接变形作用 D.减小焊接应力作用 [单选题]货车人力制动机一端篷布下垂遮盖端墙部分高度300-500mm，另一端下垂遮盖端墙部分高度( )mm左右。
A.300 B.400 C.500 D.600 [多选题]中共十一届三中全会后，邓小平领导党和人民实现了若干重要转变，即( )。
A.从“以阶级斗争为纲”转到以发展生产力为中心 B.从固守成法到各方面的改革 C.从封闭半封闭到对外开放 D.从基本上是苏联模式的社会主义转到建设有中国特色的社会主义 [判断题] 对影响铁路安全较大的河流实行二级洪水位警戒值，即注意洪水位警戒值和危急洪水位警戒值。
A.正确 B.错误 我来回答: 提交
|
