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【判断题】
低能电子衍射可以观测样品表面的原子结构信息。A.
正确
B.
错误
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【简答题】A．Because it serves only a few specialties. B．Because it's too crowded. C．Because it's too costly. D．Because the service is too slow.
【简答题】A．Because it serves only a few specialties. B．Because it's too crowded. C．Because it's too costly. D．Because the service is too slow.
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