一道全英文的工程科学题Construct a hoisting apparatus (including controlling and illuminating system) at Renhua Iron Mine with I-Beams shown in Diagram 1.To move the ore out of the mine,a mining car filled with iron ore would slip from Poin
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一道全英文的工程科学题Construct a hoisting apparatus (including controlling and illuminating system) at Renhua Iron Mine with I-Beams shown in Diagram 1.To move the ore out of the mine,a mining car filled with iron ore would slip from Poin
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