皮皮学，免费搜题
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【单选题】
钛是生活、生产中的重要金属，下列说法不正确的是（　　）
A.
潮湿的空气中能形成致密的氧化物保护膜
B.
钛合金可用于制作船舶
C.
人体中的铁元素主要存在于血液中
D.
钛合金可用于制造人造骨
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