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【单选题】
关于合金发展趋势，下列哪个选项说法是错误的？A.
简单合金就是合金元素含量少的合金；
B.
通用合金是可以满足多种服役条件、有多种用途的合金；
C.
钛合金比强度较高，在高温和低温下保持高强度，耐蚀性也是无可匹敌的。
D.
Fe-Cr-Mn系列合金是通用合金。
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B.
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