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【判断题】
泡沫灭火的主要作用是窒息和冷却( ) A. 对 B. 错A.
正确
B.
错误
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【单选题】以下说法错误的包括1收益管理只适用于求大于供时2收益管理就是打折3收益管理是酒店收益经理或收益部门完成的4收益管理投入少、见效快。( )
A.
①②③
B.
①②③④
C.
①③④
D.
②③
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