| Successful innovations have driven many
older technologies to extinction and have resulted in higher productivity,
greater consumption of energy, increased demand for raw materials, accelerated
flow of materials through the economy and increased quantities of metals and
other substances in use per person. The history of industrial development is
full of examples. In 1870, horses and mules were the prime source of power on U. S. farms. One horse or mule was required to support four human beings--a ratio that remained almost constant for many decades. At that time, had a national commission been asked to forecast the horse and mule population for 1970, its answer probably would have depended on whether its consultants were of an economic mm of mind. Had they been "economists", they would hav A. Older technologies die away. B. The quality of life is improved. C. Overall productivity increases. D. More raw materials become necessary. [判断题]遇到暴风雨雪天气或夜间无照明时,禁止手推调车。
A.正确 B.错误 [简答题]121.为完成各项客货运及运转工作，中间站一般具有哪些技术设备？《铁路职工岗位培训岗位培训教材》
[单项选择]药用五味分阴阳，属阴的是（）
A. 辛、甘、淡 B. 酸、苦、咸 C. 辛、甘、苦 D. 辛、甘、酸 E. 辛、咸、淡 [填空题]入口发放应急纸券时,应该准确地在纸券的（ ）和（ ）填写车牌号码。
[单选题]启动计算机时，按()键可打开BIOS设置界面。
A.F8 B.F1 C.F10 D.Delete [单选题]驱动机构为“ ”特有。
A.动力转向架 B.摆式转向架 C.非摆式转向架 D.非动力转向架 [单项选择]吗啡的药理作用是（）
A. 镇痛、镇静、镇咳 B. 镇痛、镇静、抗震颤麻痹 C. 镇痛、呼吸兴奋 D. 镇痛、镇静、散瞳 E. 镇痛、止泻、缩血管 [单选题]氧气瓶与乙炔发生器的距离应在（ ）以上。
A.4m B.5m C.6m 我来回答: 提交
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