What is the purpose of the equalizing beam aboard a crane vessel（）.<br>A:It allows for rotation of the hook in the single mode<br>B:It is required to“twin-up”30-ton pedestal cranes<br>C:It is used to pick up light loads<br>D:It is used to rigidly connect two cranes

What is the purpose of the equalizing beam aboard a crane vessel（）.
A:It allows for rotation of the hook in the single mode
B:It is required to“twin-up”30-ton pedestal cranes
C:It is used to pick up light loads
D:It is used to rigidly connect two cranes

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