求翻译：　　自学考试由国家授权的权威考试机构管理实施。在各级政府和教育行政部门领导下，从国家到地方有一个组织完整、运转协调的管理系统和工作系统，有一套科学严密的考试办法，因此，它能保证国家考试的科学性、严密性和权威性，能通过国家考试有效地促进和指导广泛的个人自学和社会助学，并严格地检验应考者的知识水平和能力水平，具有覆盖全国的规模和巨大的容量。是什么意思？

Authoritative examination institutions to manage the implementation of self-examination authorized by the State. Local from the national levels of government and educational administrative departments under the leadership of an organization complete operation of a coordinated management system and w

　　Self-study examination by the national authorizing authority examination bodies management implementation. In levels Government and education administrative sector led Xia, from national to local has a organization full, and running coordination of manage