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.exposure to inclement weather conditions
B.carelessness
C.the use of improper gear
D.moisture caused by condensation
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
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（）.
Official draft measurements should be（）by authorized persons，agreed by both parties involved.
Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.
What is meant by the term“l(fā)uffing the boom”of a crane（）．
Sudden starts or stops of the boom is likely to cause all of the following except（）.
Which statement comparing a shipboard crane to conventional gear is TRUE（）.
When discharging an oil cargo，the first consideration is to（）.
The Master or person in charge of a ship shall ensure the crane record book shows the（）.
Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set（）.
Damage by（）shall not be considered as handling damage.