发出预先通知的开证行应不可撤销地承诺将不延误地开出有效的信用证或修改，且条款不能与预先通知书相矛盾。
An issuing bank that sends a pre-advice is irrevocably committed to issue the operative credit or amendment, without delay, in terms not inconsistent with the pre-advice.
第十九条有下列情形之一的，要约不得撤销：（一）要约人确定了承诺期限或者以其他形式明示要约不可撤销；
Article 19 Irrevocable Offer An offer may not be revoked: (i) if it expressly indicates, whether by stating a fixed time for acceptance or otherwise, that it is irrevocable;
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