A.Cleanly/during
B.Clear/meanwhile
C.Clean/between
D.Clean/prior to
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A.slipway
B.graving dock
C.ground warp
D.caisson dock
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
最新試題
Which of the following statement（s）is/are FALSE regarding a twin pedestal crane set （）.
Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.
Official draft measurements should be（）by authorized persons，agreed by both parties involved.
What is/are the advantage（s）of cranes over conventional cargo booms（）.
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（）.
Where is the most probable location of the remote shutdown station for cargo pumps on a tank barge carrying oil（）.
Most pedestal crane power is provided by（）.
The net productivity per gang-hour can be improved through a decrease of（）.
What is the purpose of the equalizing beam aboard a crane vessel（）.
How should you signal the crane operator to lower the boom and raise the load（）.