单选题On which type davit does the davit head stay at the same height?（）A RadialB Sheath-screwC QuadrantalD Gravity

While cranking out a quadrantal davit，slippage of the quadrant due to excessive wear or failure of the teeth in the quadrant will cause the ______．

A.Davit arm to pivot on the traveling nut and the head to fall outboard

B.Traveling nut to lock up in place on the worm gear

C.Limit switch to engage and hold the traveling nut in position

D.Winch brake to lock in position and prevent lowering the boat

Which davit type may be operated by one man ________．

A.Quadrantal

B.Gravity

C.Sheath-screw

D.Radial

A、height

B、weight

C、head circumference

D、teeth growth

If a davit-launched life raft aboard a vessel cannot be launched because of damage to the davit, you should ______.

A.inflate the life raft on deck

B.roll the life raft over the side

C.go to another life raft station

D.get a saw and cut the life raft free

The most common type of davit found on merchant vessels today is the ______．

A.Radial

B.Sheath-screw

C.Gravity

D.Quadrantal

Which type of davit is not considered to be a mechanical davit ________．

A.Sheath-screw boom

B.Radial

C.Crescent

D.Quadrantal

A patient in shock should NOT be placed in which position?

A.On their side if unconscious

B.Head down and feet up，no injuries to face or head

C.Flat on their back with head and feet at the same level

D.Arms above their head