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 technolo A. The Future of Transportation B. Argonne Develops Maglev Train C. The Disadvantages of Commuting by Airplane D. Commuting in the Future [填空题]断层观测.描述主要确定().产状.断距及周边岩性,并详细描述
[多项选择]图解型电视教材力求画面具有丰富的表现力,但仍然会存在一些问题,主要表现在().
A. 用语言比用画面呈现更为有力 B. 画面未必能呈现所有的教学信息内容 C. 选择的画面不够典型 D. 组合的画面镜头数量不够 [单项选择]探望病人应送什么样的鲜花表示康宁?()
A. 白百合 B. 红色康乃馨 C. 剑兰 D. 牡丹 [填空题]在齿轮测量中,不受基准限制的测量项目是()测量。
[单项选择]下列外科急腹症的X线腹部平片影像特征中,错误的是()。
A. 肠管内"气液平" B. 膈下游离气体 C. 肠壁间距增宽 D. 肝顶部或胃底部与膈肌之间显示结肠袋影 E. 空、回肠换位征 [判断题]使用中的气瓶可以放在烈日下暴晒,可以离火源及高温区较近,但距明火不应小于10m。( )
A.正确 B.错误 [单选题]由交感神经和副交感神经共同支配的是
A.血管 B.汗腺 C.竖毛肌 D.肾上腺髓质 E.消化管 [判断题]根据《供电营业规则》的规定,窃电时间无法查明时,电力客户每日窃电时间按8h计算。
A.正确 B.错误 [判断题]有限空间危险作业审批表是进入有限空间作业的依据,不得涂改且要求安全管理部门存档时间至少两年。
A.正确 B.错误 [单项选择]公路工程招标的招标人应当自确定中标人之日起( )天内,将评标报告向有关交通主管部门进行备案。
A. 7 B. 15 C. 20 D. 30 [单选题]:摇表测量绝缘电阻时,摇动手柄的转速应保持在()r/min,直至表针稳定时读出数据。
A.100 B.120 C.150 [判断题]外部分组是按照学生的发展水平来编班。
[单项选择]一般而言,骑马订比较适合()的书籍的装订。
A. 纸张较薄、页数较少 B. 纸张较薄、页数较多 C. 纸张较厚、页数较多 D. 各种类型 我来回答: 提交
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