不定项选择

翼肋的功能是维持流线型的翼形，气动载荷直接作用在翼肋上，再传递给其他横向和纵向的构件。‏

A．错误
B．正确

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According to theUnited Nations Convention on Contracts for the International Sale of Goods (CISG), if an offer contains a statement that “the offeror will consider the offer accepted unless the offeree responds otherwise within X number of days,” the offeree’s failure to respond will constitute an acceptance. A、正确 B、错误

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正交矩阵的逆矩阵仍是正交矩阵. ( )

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