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
A.one meter from the tank bottom and one meter below the tank top
B.one half the ullage of the tank and one meter below the tank top
C.one half the ullage of the tank and one meter above the tank bottom
D.at three meter intervals from the tank top
A.winch speed
B.boom strength
C.load radius
D.cable strength
A.discharging
B.recircling
C.loading
D.taking in
最新試題
Which of the following statements is FALSE concerning cranes being installed on the centerline of vessels（）.
Running an electric winch at slow speed over a long period of time causes（）.
Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.
Pedestal cranes have limit switches to restrict movement of which function（s）（）.
What is the purpose of the equalizing beam aboard a crane vessel（）.
The item（）is not the advantage of the hydraulic winch．
What does “evel-luffing” accomplish during crane operations（）.
What is/are the advantage（s）of cranes over conventional cargo booms（）.
Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set（）.
Official draft measurements should be（）by authorized persons，agreed by both parties involved.