What is NOT an advantage of the house-fall system when compared to a married-fall system using two of the ship’s booms? ()
A、There is a steady spotting area under the dockside block
B、Loading can be accomplished from a narrow apron without endangering the inboard boom
C、The system can be used for working the second deck of a warehouse
D、There is more accurate control of cargo drafts required to be stowed in the wings