A.increase the lifting capacity
B.increase the lifting radius
C.protect the slings
D.protect the upper part of a load
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A.keeps sparks from falling into an open tank
B.secures covers on ullage openings
C.prevents sparks from getting out of an engine's exhaust system
D.grounds static electricity
A.blind flange
B.pivot coupling
C.quick-release coupling
D.spectacle flange
A.yearly inspection
B.quarterly inspection
C.monthly inspection
D.weekly inspection
A.keep a line from fraying
B.join lines of unequal size
C.stop off a line
D.shorten a line
A.positive correction
B.dip error
C.negative correction
D.semidiameter error
最新試題
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（）.
The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
In relation to cargo gear，what does SWL mean?（）.
An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.
Limit switches are used on which davits?（）
The rudders are amidships and both screws are going ahead. What will happen if the starboard screw is stopped?（）
If the engine of a survival craft does not start，check to see（）.
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（）.
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.