For the omen and the reason of malfunctions,the same malfunction can be caused by many facts,and the same malfunctions can lead in a lot of malfunction omens.

• 因此,系统及分系统的故障也是纷繁复杂的,反映在故障征兆(表象)与原因上,同一故障征兆可能是多种原因所引起的,而同一故障原因又往往产生多种故障征兆。