这简单。再建一套类似声纳网的地道掘进探测系统。加上飞机探地雷达定期探测。

来源: asiancarp 于 2017-01-31 09:31:46 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.