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visiting to be visited having visited visited
100P mile 200P mile 300P mile 400P mile
20n mile 大于 20n mile 小于20n mile 不能确定
Cover Covered To cover Having covered
15 liters/ nautical mile 30 liters/ nautical mile 60 liters/ nautical mile 100 liters/ nautical mile
covering having covered to cover to have covered
to cover covered having covered covering
正南 200 n mile 西南偏南 300 至 600 n mile 西南 100 n mile 东南偏南 200 n mile
Covering Having covered To cover Covered
155.5n mile 150.3n mile 145.5n mile 160.5n mile
2n mile 3.5n mile 4/3n mile 8/3n mile
covering having covered to cover to have covered
DepAD＞DepBC DepAD＜DepBC DepAD=DepBC DepAD≤DepBC
正南 200 n mile 西南偏南 300 至 600 n mile 西南 100 n mile 东南偏南 200 n mile
already cover already covered have already cover had already covered
cover covering covered having covered
covering to be covered to have been covered having been covered
Before a mile or so when For a mile or so after Farther than a mile or so A.mile or so before
Seeing, covering Having seen, covered To see, covered Seen, covered
2n mile 1.7n mile 1n mile 3.2n mile
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