A.brake
B.devil's claw
C.pawls
D.All of the above
您可能感興趣的試卷
你可能感興趣的試題
A.sand
B.soft soil
C.stiff clay
D.heterogeneous soil
A.shear ram
B.blind ram
C.pipe ram
D.annular ram
A.articulated anchor
B.Flipper Delta anchor
C.Baldt anchor
D.Danforth anchor
A.fairlead
B.heaving line
C.stay
D.warp
A.prevent them from falling when the vessel rolls
B.protect personnel from electrical shock
C.increase their operating efficiency
D.prevent unauthorized personnel from operating them
最新試題
An LWT anchor often has difficulty tripping in（）.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
Limit switches are used on which davits?（）
All electrical appliances aboard a vessel should be grounded to（）.
The connected joints of pipe，usually made of three joints of pipe approximately 90 feet long，racked in the derrick when making a trip are called a（）.
The bypass valve on a self-contained breathing device should be opened if（）.
As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.
In nautical terminology a dog is a（）.
In relation to cargo gear，what does SWL mean?（）.
The exhaust pipe must be gas tight throughout its entire length otherwise（）.