1, QTJ4-40 need small volume and easy to operate and maintain 2, QTJ4-40 need small investment, small manpower
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BEIJING ZHONGCAI JIANKE INSTITUTE OF SCIENCE AND TECHNOLOGY FOR BUILDING MATERIALSVIP会员第13年
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1, QTJ4-40 need small volume and easy to operate and maintain 2, QTJ4-40 need small investment, small manpower
