A.Moving high weights lower
B.Adding weight at the tipping center
C.Moving a weight forward
D.Moving lower weight high
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A.Arch the back to add strength to the muscles
B.Bend his knees and lift with his legs
C.Bend his back and stoop
D.Bend his back and stoop with arms straight
A.Cranes are able to pick up and drop loads over a greater spotting area
B.Increased safety because the deck is clear of running and standing rigging
C.Simplicity of operation of the crane by its operator
D.All of the above
A.It prevents the load from swinging when the boom level is adjusted
B.Less power is needed when topping the boom with a load on the hook
C.It maintains the height of the load above the deck
D.All of the above
A.At a 45° angle
B.At right angles
C.4 feet aft of the heel of the boom
D.Parallel to the boom
A.breaking a cargo runner
B.parting guys topping lifts
C.carrying away a block
D.overheating the resistors and eventually burning out
A.Cargo whip
B.Gooseneck fitting
C.Spider band
D.Topping lift
A.Cranes/derricks
B.Crane/derrick cycles
C.Crane/derrick cycle time
D.Weight per package
A.It allows for rotation of the hook in the single mode
B.It is required to“twin-up”30-ton pedestal cranes
C.It is used to pick up light loads
D.It is used to rigidly connect two cranes
A.Extend arm and point finger in the direction to move the boom
B.Extend arm with thumb pointing downward and flex fingers in and out
C.With forearm vertical and forefinger pointing up，move hand in small horizontal circles
D.With arm extended downwards and forefinger pointing down，move hand in small horizontal circles
A.Loading
B.Discharging
C.Crude oil washing
D.Steaming tanks
最新試題
The item（）is not the advantage of the hydraulic winch．
Official draft measurements should be（）by authorized persons，agreed by both parties involved.
Which statement is FALSE concerning a tagline as used with a 30-ton pedestal crane（）.
Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited（）.
Which part provides for transverse control and positioning of a boom in a conventional yard and stay system（）.
What is/are the advantage（s）of cranes over conventional cargo booms（）.
When viewed from above，the best position for the guy in relation to the boom is（）.
If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor（）.
Running an electric winch at slow speed over a long period of time causes（）.
When instructing a crew member concerning the right way to lift a weight，you would instruct him to（）.