【摘要】 本文指出，任何一个系统当其中的所有元素均失效完全相关时（简称完全相关系统），它将只有一种失效模式即所有元素均失效，同时也只有一种有效模式即所有元素均有效，因而蜕化成为一个特殊的基元系统，它只有一个整体的可靠度，而不存在元件单独的可靠度，实质上，所有的完全相关系统都只是起一个单元素的作用．本文对此进行了数学的和力学的论证，并纠正了某些不确切的概念．更多还原

【Abstract】 If the failures of all the elements in a system are completely dependent on one another (called failure - complete - dependent system), the system only has one failure form (all the elements are of failure) and one elective form (all the elements are of elective). The system has only one reliability of the whole system but has not a reliability of a single element. In fact, any failure - complete - dependent system plays a role of a single element. These conclusions are proved in mathematics and mechanics, and some existing conceptions are corrected in this paper.更多还原