Aboard ship, vertical flat plates running transverely and connecting the vertiacl keel to the margin plates are called（）.

A . signaling that all personnel are clear before lifting or lowering material B . Examining material for sharp edges or protruding points before handling C . Closing, tagging, or securing valves that permit entrance of steam, water, or air into a fitting or other equipment D . Throwing materials from high places to the deck

A . two rockets，one of which shall be the buoyant type B . three rockets，one of which shall be the buoyant type C . four rockets，two of which shall be the buoyant type D . five rockets，two of which shall be the buoyant type

A . the single hook at the top of the raft B . two lines passed under the raft C . the towing bridle D . All of the above

A . also called decks B . vertical transverse plates connecting the vertical keel with the margin plates C . large beams fitted in various parts of the vessel for additional strength D . found in passenger and berthing spaces only

A . height of the center of gravity A.LCG B . vertical moment C . righting moment D . inclining moment

A . electromagnetic field, revolving armature type B . electromagnetic field, oscillatory armature type C . armature, oscillatory electromagnet field type D . armature, rotating electromagnetic field type

A . station bill B . clearance papers C . certificate of inspection D . permit to proceed

A . Shrouds B . King posts C . Stays D . Turnbuckle

A . temperature rise B . input kilowatts C . horsepower D . operating voltage

A . decks B . bulkheads C . joiner work D . wall

A . towing bridle B . main weather cover C . external lifelines D . righting stra

A . More than six short blasts and one long blast on the whistle B . Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm C . Three short blasts of the whistle supplemented by the same signal on the general alarm D . More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm

A . 正确 B . 错误

A . floors B . intercostals C . girders D . stringer

A . portable growler B . galvanometer C . visual inspection D . megohmmeter

A . the designated medic aboard B . the shore based superintendent C . a medical doctor D . the approved company medical manual

A . as a connecting strap between the butted ends of plating B . to stiffen areas under points of great stress between beams C . to prevent the anchor from fouling when the brake is released D . to provide an extra heavy fitting in a lift cargo released

A . lower personnel down by a transfer basket B . lower food and water to personnel in a life raft C . lower the life raft down with its full complement D . move equipment around the deck

A . muster list B . certificate of inspection C . clearance papers D . permit to proceed

A . Soda acid B . Carbon dioxide C . Dry chemical D . Cartridge-operated Foam

A . LCG B . transverse moment C . righting moment D . inclining moment

A.height of the center of gravity B.vertical moments C.righting moments D.inclining moments