题目内容
Absolute advantage assumes that labor can switch between products easily and they will work with same______ which in reality cannot happen.
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Import License, Export License, Certificate of Origin, Inspection Certificate, Consular Invoice, and Customs Invoice are usually regarded as _______________ .
Pro forma invoice, commercial invoice, quality certificate and weight certificate are usually regarded as ______________________.
A ______________ is sometimes called a "Form A".
In the collection method of payment for goods, a __________ is always drawn upon the importer by the exporter to get paid.
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