单选题In a general cargo crane, () is fitted to raise or lower the jib.Athe slewing motorBthe luffing motorCthe hoisting motorDnone of the above
单选题
In a general cargo crane, () is fitted to raise or lower the jib.
A
the slewing motor
B
the luffing motor
C
the hoisting motor
D
none of the above
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Which of the following actions are stated in the correct order prior to loading or discharging cargo on a Ro-Ro vessel?A.Lower the stern ramp,raise/open the stern door,turn on ventilation for cargo holdsB.Turn on ventilation for cargo holds,raise/open the stern door,lower the stern rampC.Turn on ventilation for cargo holds,lower the stern ramp,raise/open the stern doorD.Raise/open the stern door,lower the stern ramp,turn on ventilation for cargo holds
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