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《工程建设重大事故报告和调查程序规定》规定，工程重大事故发生后，事故发生单位应当在()小时内写出书面报告，按程序和部门逐级上报。
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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 turn of mind. Had they been "economists", they would have recognized that the power of steam had already been harnessed to industry and to land and ocean transport. They would have recognized further that would be only a matter of time before steam would be the prime source of power on the farm. It would have been difficult for them to avoid the conclusion that the horse and mule population would decline rapidly.
Which of the following is NOT mentioned by the author as a consequence of new technological developments？
适用于交通量大、轴载重的道路的基层材料是()。
在正常工作情况下，燃气通过过滤器的压力损失不得超过()MPa。
城市轨道交通地面车站的岛式站台的最小宽度为()m。
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