搜题
王老师:19139051760(拨打)
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第1题

根据N规律,由C,H,O,N组成的有机化合物,N为奇数,M一定是奇数;N为偶数,M也为偶数。( ) 正确 错误
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第2题

核磁共振波谱法与红外光谱法一样,都是基于吸收电磁辐射的分析法。( ) 正确 错误
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第3题

He was such a ____ speaker that he held our attention every minute of the three-hour lecture. A、specific B、dynamic
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第4题

Although he had looked through all the reference material on the subject, he still found it hard to understand this po
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