A towing vessel should be on the crest of a wave at the same time as its tow and in the trough at the same time. The term used to describe this is（）.

A . stored safely in a cool dark non-ventilated area until work is completed B . resealed and returned to a well ventilated area after each use C . covered at all times to protect from ignition sources D . stored in a suitable gear locker

A . No fog signal B . A prolonged blast at intervals never to exceed more than two minutes C . A prolonged blast followed by two short blasts at intervals never to exceed more than two minutes D . A prolonged blast followed by three short blasts at intervals never to exceed more than one minute

A . chain B . wire C . nylon D . manila

A . boarding and operating procedure B . maintenance schedules C . navigational systems D . fuel consumption rate

A . Add ballast in the afterpeak B . Add ballast forward C . Alter course D . Reduce speed

A . stopped with the wind dead ahead B . stopped with the wind on the beam C . underway with the wind 30°on the bow D . underway on a course to provide no apparent wind

A . hydrocarbon gas B . carbon monoxide gas C . carbon dioxide gas D . freon ga

A . two balls in a vertical line B . a diamond shape where it can best be seen C . a ball on each end of the tow D . no dayshape

A . at times B . at any time C . at no time D . at moment

A . a Coast Guard inspector B . a registered professional engineer C . the owner or Master of the vessel D . a licensed electricia

A . pushed ahead B . towed alongside C . towed astern D . Any of the above

A . crew members using their arms B . crew members using the strong muscles of their legs C . fenders D . No fending is necessary due to the rugged construction of most towing vessel

A . no matter where they are and what time it is B . at scheduled time and in major ocean regions C . at fixed time and position D . when they get permissio

A . readily accessible B . securely stowed C . stored in sealed containers D . stowed with the emergency provisio

A . all information contained on the barge's Certificate of Inspection B . the condition of all towing gear to be used C . all navigational aids to be used D . the barges load line and draft reading

A . eddies under the bar B . swift current under the bar causing loss of control C . cross-currents pushing the tow away from the bar D . cross-currents pushing the tow into the bar

A . all mooring lines have a different tension B . the leeward lines have higher tension than the windward lines C . the maximum tension of the most heavily loaded line does not exceed the safe working load D . all horizontal tension forces on the windward lines are no greater than the vertical tension force

A . no fog signal B . one short blast C . one prolonged and three short blasts D . one prolonged，one short，and one prolonged blast

A . forward masthead light B . after masthead light C . stern light D . All of the above

A . Two to four feet by the bow B . Slightly by the bow C . No trim should be permitted D . Slightly by the ster

A . not exceed bare steerageway during the transit B . take a strain as soon as you can to control the tow C . come up to speed very slowly and maintain a safe speed D . come up to speed quickly，then cut back power considerably to ease the strai

A . Carbon dioxide B . Water (stored pressure) C . Foam D . Carbon tetrachloride

A.pushed ahead B.towed alongside C.towed astern D.Any of the above