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A.though B.through C.thorough D.thoroughly??D0182 ______ are aids to
navigation which are permanently fixed to the earth's surface.A.Buoys B.Beacons
C.Flares D.Horns ??B0183 Backfire ...... All military exercises on the high seas
involving four or more vesselsD. Off-air times of radio beacons when scheduled
for ...