以上来源于: WordNet
Mi-17, entered service in 1975, is the highly improved Mi-8, with more powerful engines for 'hot and high' conditions.
米-17是米-8的深入改进型号,为提高高海拔高温性能,采用了更加强大的发动机,于1975年开始服役。
It now stretches 8, 851.8 km (5, 500.3 mi), with approximately 2, 232 km of that natural barriers such as hills and rivers.
现在长城长8,8851.8千米,其中约2232千米是像山丘、河流的天然屏障。
And then studied the area channel flowed along and destructiveness to the coal seam, provide a reference for the mining of coal seam 8 in mi…
并对古河流的流经区域和煤层的破坏程度作了研究,为井田中深部八煤层的开采提供了参考依据。
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