A.slipway
B.graving dock
C.ground warp
D.caisson dock
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A.Hydraulic drive systems
B.Electric drive systems
C.Steam drive systems
D.Man-powered drive systems
A.a master controller or switchbox
B.a group of relays
C.contactors
D.a solenoid brake
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最新試題
Which of the following statement(s)is/are TRUE regarding a twin pedestal crane set().
Which statement comparing a shipboard crane to conventional gear is TRUE().
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.
What is the purpose of the equalizing beam aboard a crane vessel().