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【多选题】
下列关于贸易成本的说法正确的有（ ）。A.
服务贸易成本高于货物贸易成本
B.
货物贸易成本高于服务贸易成本
C.
2000年之后服务贸易成本有所上升
D.
2000年之后服务贸易成本有所下降
E.
科学技术的发展对服务贸易成本有很大影响
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A.
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