题目内容
A letter of credit which does not indicate whether it is revocable or not is regarded as irrevocable.
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Open account and payment in advance indicate the minimum and maximum risk for the importer.
Dishonor only refers to the rejection to the presentation for payment, but not rejection to the presentation for acceptance.
路由器A将收到的从电脑B发给电脑A的数据从它的1号口发送给路由器B的2号口，路由器B收到的数据，下面描述正确的是（）
在路由表中0.0.0.0代表什么意思（）。
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