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
Sudden starts or stops of the boom is likely to cause all of the following except（）.
What is meant by the term“l(fā)uffing the boom”of a crane（）．
Which statement comparing a shipboard crane to conventional gear is TRUE（）.
Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.
Regulations concerning the stowage，lashing，and securing of timber deck cargoes aboard general cargo vessels may be found in the（）.
What does “evel-luffing” accomplish during crane operations（）.
How should you signal the crane operator to hoist（）.
They（）loading at 1400 hours．
Most pedestal crane power is provided by（）.
When discharging oil from an oil tanker the instantaneous rate（）60 liters per nautical mile.