请教pay by irrevocable L/C 100% payable at sightirrevocable L/C 100% payable at sight什么意思?谢谢不好意思,把一句话连续copy了2遍:请大家帮我看看"pay by irrevocable L/C 100% payable at sight"什么意思,谢了

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请教pay by irrevocable L/C 100% payable at sightirrevocable L/C 100% payable at sight什么意思?谢谢
不好意思,把一句话连续copy了2遍:
请大家帮我看看"pay by irrevocable L/C 100% payable at sight"什么意思,谢了

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