在都江堰,一台大型挖掘机从一大堆碎石中铲出混凝土板和扭曲的金属杆。
In Dujiangyan, a large mechanical digger scoops slabs of concrete and twisted metal rods from a massive pile of rubble.
本文设计了大型挖掘机直流传动系统的激磁调节电路。
An excitation control circuit tor direct current drive system of large power shovel has been designed.
根据引进美国P&H公司挖掘机制造技术,探讨了大型挖掘机零件热处理技术要求的规律性。
The regularity of technical requirements for heat treatment of power shovels are investigated on the basis of licenced technique from P & H, U. S. A.
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