... true ground speed meter 真速测速仪 true ground speed 对地真航速 true heading 真船首向 ...
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true ground speed meter 真地速测速仪 ; 真速测速仪
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The frequencies of the returned beams are compared with them to obtain the true ground speed.
将它们与反回射束作对比而获得真实的地面速度。
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