单选题（） can be operated independently or locked together and operated as a twin-job cranes of double capacity.ATwo derricksBA derrick and a craneCTwo cranesDA crane and a winch
单选题
（） 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
参考解析
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