皮皮学，免费搜题
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【多选题】
降低产品成本的途径包括A.
控制工资费用
B.
降低材料采购成本
C.
控制制造费用
D.
控制管理费用
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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