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【单选题】
马歇尔一勒纳条件是指以贬值手段改善贸易收支逆差的充分条件在于：进出口商品的需求弹性之和大于1。不是其假设前提的是（）
A.
国内外商品都具有无限供给弹性
B.
以国际收支均衡为初始状态
C.
其他条件不变，只考察汇率变动对进出口的影响
D.
以国际收支不均为初始状态
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