单选题Which action(s) is/are included in crane operations?（）ANormal boom stowage and shutdown operationsBEmergency shutdown operationCRemoving booms from stowageDAll of the above
单选题
Which action(s) is/are included in crane operations?（）
A
Normal boom stowage and shutdown operations
B
Emergency shutdown operation
C
Removing booms from stowage
D
All of the above
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