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为了解青岛市国内航行船舶蟑螂侵害情况,更好地指导今后船舶蟑螂消杀工作,我们于1997年11月对本市部分船舶蟑螂侵害情况进行了调查分析,并对照1994年的调查结
In order to understand the infringement of cockroach in Qingdao domestic navigation vessels and to better guide the future cockroach killing of ships, we carried out investigation and analysis of the cockroach infiltration of some ships in this Municipality in November 1997, and compared with the survey results of 1994