Upon underwater detection, there were no apparent defects on the bottom plates, bilge keels,rudder and propeller of the said vessel. This kind of wording usually appeared on().
()is a roud-shaped underwater part in the front of the ship.The purpose is to cre-ate less friction with water so that the ship moves more easily.
The underwater listening system was originally designed ______.
Upon underwater detection,there were no apparent defects on the bottom plates,bilge keels,rudder and propeller of the said vessel.This kind of wording usually appeared on().
Upon underwater()by divers,there are no apparent()on the bottom plates of the said vessel.
The two factors which make underwater hull repair difficult are accessibility and the().
A snag or other underwater obstruction may form a().
A snag or other underwater obstruction may form a().
The underwater listening system was originally designed ______.