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Refractory metals are those metals which have extremely low melting temperatures
Refractory metals are those metals which have extremely low melting temperatures
A.正确
B.错误
正确答案：错误
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材料导论
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For brasses, tin is the predominant alloying elements as substitutional impurity.
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For some stainless steels, when heated to a certain temperature range (（）) for a sufficiently long time, these alloys become sensitized to intergranular attack