题目内容
The counter back letter of credit is opened on the basis of the original letter of credit, which must have a letter of credit of ().
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According to UCP500, each letter of credit must specify the period of validity. If the validity period of a letter of credit is "one month" or "six months", but does not specify when to start, then it should be understood as starting from ().
When using the method of collection, whether the collecting bank should pay for the payment? ()
If the credit has not indicated the drawee, the drawee should be written as（）.
The basis of bank's examination and negotiation are（）.
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