A.when the line pull reaches the rated winch capacity
B.after the line pull exceeds the rated winch capacity
C.after a short build-up of torque
D.immediately
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A.Use one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signa
B.Extend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desired
C.First tap your elbow with one hand and then proceed to use regular signals
D.First tap the top of your head with your fist and then proceed to use regular signals
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.With forearm vertical and forefinger pointing up，move hand in small horizontal circles
B.With arm extended downwards and forefinger pointing down，move hand in small horizontal circles
C.Extend arm with fingers closed and thumb pointing upward
D.Place both fists in front of body with the thumbs pointing upward
A.Keep the loads as close to the rail or deck as possible
B.If cargo is likely to settle，make provisions to secure it after it has settled
C.Thoroughly secure and shore all cargo so that it cannot move
D.hen stowing cargo，avoid leaving empty paces
最新試題
What is meant by the term“l(fā)uffing the boom”of a crane（）．
When instructing a crew member concerning the right way to lift a weight，you would instruct him to（）.
Pedestal cranes have limit switches to restrict movement of which function（s）（）.
Which method should be used to warm up the pump turbines prior to discharge（）.
The item（）is not the advantage of the hydraulic winch．
How should you signal the crane operator to lower the boom and raise the load（）.
Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.
Where is the most probable location of the remote shutdown station for cargo pumps on a tank barge carrying oil（）.
Which part provides for transverse control and positioning of a boom in a conventional yard and stay system（）.
What does “evel-luffing” accomplish during crane operations（）.