多项选择题

镁合金的使用范围 A. 交通运输 B. 航空航天 C. 军工领域 D. 电子器件

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单项选择题

By exchanging gifts, a person in love sometimes discovers that the love is ________ , and that his or her feelings are returned.
A、chanced
B、abundant
C、mutual
D、inherent

单项选择题

A、(1)
B、(2)
C、(3)
D、(4)