A.which
B.where
C.when
D.how
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A.before
B.when
C.after
D.during
A.maximum counter weight required
B.minimum horsepower required
C.hoist rope strength
D.allowable load
A.horizontal position of the boom
B.vertical position of the boom
C.horizontal position of the load being lifted
D.vertical position of the load being lifted
A.length of the boom
B.angle of the boom
C.lifting capacity of the boom
D.direction of the boom
A.to use
B.to operate
C.maneuvering
D.using
最新試題
Running an electric winch at slow speed over a long period of time causes（）.
How should you signal the crane operator to lower the boom and raise the load（）.
Most pedestal crane power is provided by（）.
Damage by（）shall not be considered as handling damage.
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（）.
Regulations concerning the stowage，lashing，and securing of timber deck cargoes aboard general cargo vessels may be found in the（）.
The item（）is not the advantage of the hydraulic winch．
Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.
When discharging an oil cargo，the first consideration is to（）.
The net productivity per gang-hour can be improved through a decrease of（）.