题目内容
According to UCP500, if a letter of credit does not indicate whether it can be revoked, it can be understood as（）.
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UCP600 provides that if a letter of credit does not indicate whether the letter of credit is transferable, it can be understood as（）.
UCP600 stipulates that the number of times a transferable letter of credit is transferred is（）.
In actual business, which of the following is called "red clause letter of credit"？（）
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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