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【单选题】
塑性成形是指在外力作用下，使金属材料产生的塑性变形，以获得所需形状、尺寸和力学性能的毛坯或零件的一种（ ）成形加工方法。A.
液态
B.
固态
C.
粉体
D.
玻璃态
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皮皮学刷刷变学霸
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