A.increase the lifting capacity
B.increase the lifting radius
C.protect the slings
D.protect the upper part of a load
您可能感興趣的試卷
你可能感興趣的試題
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
Static electricity may be built up by the（）.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
Permission is kindly requested（）the ballast water.
As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.
In nautical terminology a dog is a（）.
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（）.
Each cylinder in a two stroke cycle engine experiences combustion（）.
The exhaust pipe must be gas tight throughout its entire length otherwise（）.
An LWT anchor often has difficulty tripping in（）.
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（）.