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单选题
577. 典型的两片式飞机机轮是由铝或镁合金铸造或锻造而成。
A
The typical modern two-piece aircraft wheel is cast or forged from aluminum or titanium alloy;
B
The typical modern two-piece aircraft wheel is cast or forged from aluminum or magnesium alloy;
C
The critical modern two-piece aircraft wheel is cast or forged from composite or magnesium alloy;
答案解析
正确答案：B
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