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当前学科:秘书三级
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某商场设有自动售报机,顾客只要按要求投入硬币,即可得到当天日报一份,此种成立买卖合同的形式为()。
A . A、书面形式
B . B、口头形式
C . C、推定形式
D . D、默示形式
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