During the dock repair, each sea valve must be disassembled,

A.Overhaul repair is a major repair.

B.Overhaul repair is carried out in a dock.

C.Overhaul repair is carried out once a year.

D.Overhaul repair is done for the purpose of rating.

You should log all barometer readings taken at sea ______.

A.regularly

B.at least once during each watch

C.more often under changeable weather conditions

D.All of the above

Although a ship usually has repair in a shipyard, ________ is also necessary

A.the general repair on board

B.the voyage repair

C.the annual repair

D.the dock repair

During the dock repair,______should be measured firstly before tail shaft drawn out.

A.the sinking of tail shaft

B.the clearance of stern bearing

C.the total flexure of shaft

D.main engine crankshaft deflection

Which statement concerning GMDSS Radio Operator requirements is FALSE ________．

A.Each compulsory vessel must carry at least two licensed GMDSS Radio Operators at all times while at sea

B.Each compulsory vessel must carry at least two licensed Radio Operators at all times while at sea and may elect to carry a GMDSS Radio Maintainer as well

C.Communications involving safety of life at sea do not have to be logged as long as the compulsory vessel was not involved in such communications

D.While at sea，adjustments to，and the maintaining of，GMDSS equipment may be performed by the GMDSS Radio operator as long as the work is supervised by an onboard licensed GMDSS Radio Maintainer

A、by sea, at sea

B、by the sea, at the sea

C、by the sea, at sea

D、by sea, at the sea