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工程
The discipline, art, skill and profession of applying scientific knowledge and principles to the design and manufacturing of machines, structures, devices, systems, materials and processes.
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工程 > Electronic engineering 
milliroentgen (先生)
工程; Electronic engineering
小单位的放射性剂量 ；1 先生 = 10 作为增量 （0.001) 伦琴 = 2.57976 × 10 –7 Ci/kg。
