A.a master controller or switchbox
B.a group of relays
C.contactors
D.a solenoid brake
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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
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
Running an electric winch at slow speed over a long period of time causes（）.
Pedestal cranes have limit switches to restrict movement of which function（s）（）.
Where is the most probable location of the remote shutdown station for cargo pumps on a tank barge carrying oil（）.
Which method should be used to warm up the pump turbines prior to discharge（）.
The item（）is not the advantage of the hydraulic winch．
What is/are the advantage（s）of cranes over conventional cargo booms（）.
How should you signal the crane operator to move slowly（）.
When using slings，cargo handlers should take all the following precautions except（）.
Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.
What is meant by the term“l(fā)uffing the boom”of a crane（）．