单选题What is/are the advantage（s）of cranes over conventional cargo booms（）.ACranes are able to pick up and drop loads over a greater spotting areaBIncreased safety because the deck is clear of running and standing riggingCSimplicity of operation of the crane by its operatorDAll of the above
单选题
What is/are the advantage（s）of cranes over conventional cargo booms（）.
A
Cranes are able to pick up and drop loads over a greater spotting area
B
Increased safety because the deck is clear of running and standing rigging
C
Simplicity of operation of the crane by its operator
D
All of the above
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