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砼搅拌机综合应用工程塑料河南省焦作市建设机械股份有限公司梁立正据有关资料，１９９０年到２０００年国外工业部门材料构成的变化特点是：黑色金属由８５．４％降至５３．２％；铜由０．９％降至０．５％；铝由３．０％增至５．９％；而塑料则由１０．７％增至４０．４...
砼 Mixer application of integrated engineering plastics Henan Jiaozuo Construction Machinery Co., Ltd. Liang Lizheng According to relevant information, the characteristics of changes in the composition of foreign industrial sectors from 1990 to 2000 are: ferrous metals from 85.4% to 53.2%; Copper decreased from 0.9% to 0.5%; aluminum increased from 3.0% to 5.9%; and plastic increased from 10.7% to 40.4...