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【多选题】
埋弧焊机的特性包括（）等。
A.
生产效率高，焊接质量好，劳动条件好
B.
埋弧自动焊是依靠颗粒状焊剂堆积形成保护条件，主要适用于平位置焊接
C.
埋弧焊剂的成分主要是MnO、SiO2等金属及非金属氧化物
D.
不适用于长缝的焊接
E.
只适合焊接薄
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