（） can be operated independently or locked together and operated as a twin-job cranes of double capacity.<br>A:Two derricks<br>B:A derrick and a crane<br>C:Two cranes<br>D:A crane and a winch

（） can be operated independently or locked together and operated as a twin-job cranes of double capacity.
A:Two derricks
B:A derrick and a crane
C:Two cranes
D:A crane and a winch

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