u boat
u boat
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The U boat campaign makes it necessary to restrict severely the reading of signals by unauthorised persons .
因潜艇战役,必须严禁未经许可的人员读取通信信号。
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Laser Communication to U - boat Study on Hydrofoil Maneuvering
激光对潜通信的作用及前景水翼船机动操作特征探讨
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Once again I forbid all authorities who have not express orders from the operations division or the Admiral commanding U boats to tune in on the operational U boat wave .
我再次重申,所有未接到行动部门或海军潜艇指挥部的命令者,严禁接收潜艇行动频道。