______ is more secure than revocable one, hence the ______ is most often used in practice. According to UCP600, if an L/C is not marked as being irrevocable or not, it should be taken as ______.
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【单选题】认为管理就是通过其他人把事办好,是强调( ) A. 核心环节 B. 作业环节 C. 本质 D. 对人的管理