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留置权因合同而产生,因此,留置权是约定担保物权。()

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因污染环境造成损害的,不论污染者是否有过错,都应当承担侵权责任。()

侵权行为人承担无过错责任必须有法律的明文规定。()

The session the audience most probably hears at last and gives the lasting impression is ______.

Voiceprints can be used in criminal trials as guides to personal identity because everybody's voice is ______.

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