软件成了延误计划的关键(30,20)
Publisher: 中航出版传媒有限责任公司
ISSN: 1000-4009
Source: 《国际航空》, Vol., Iss., 1989-07, pp. : 30-29
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《国际航空》, Vol. , Iss. , 1989-06 ,pp. :