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【单选题】
关于铸件的冷却方式，说法不正确的是（）
A.
纯钛金属则采取缓慢降温冷却
B.
18-8不锈钢，待金属凝固后立即投入冷水中冷却
C.
以上说法均不正确
D.
包括快速降温冷却和缓慢降温冷却
E.
中熔合金铸件待合金凝固后约1分钟，将整个铸圈放入室温水中冷却
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