A.Should not exceed
B.Must be up to
C.Should exceed
D.Should be about
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A.get the bow up
B.discharge from the wings first
C.discharge from the centerline tanks first
D.discharge from amidships first
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 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.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
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
最新試題
When instructing a crew member concerning the right way to lift a weight，you would instruct him to（）.
Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited（）.
Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.
Official draft measurements should be（）by authorized persons，agreed by both parties involved.
When using slings，cargo handlers should take all the following precautions except（）.
The net productivity per gang-hour can be improved through a decrease of（）.
Damage by（）shall not be considered as handling damage.
How should you signal the crane operator to move slowly（）.
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（）.
Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.