Irrevocable credits are those that cannot be amended or revoked without the consent of all the parties concerned. Safe and reliable, this type is extensively used in world trade. It must be noted that if there is no specific indication whether a credit is revocable or irrevocable, it should be regarded as irrevocable.
【正确答案】：不可撤销信用证是指未经有关当事人同意，不可随意修改或撤销的信用证。这种信用证既安全又可靠，在国际贸易中广泛使用。必须指出的是，如果信用证上未标明“可撤销”还是“不可撤销”，应该为不可撤销信用证。
【题目解析】：参见教材P171。
