单选题The only type of helicopter that may be refueled with the engine running and the blades turning is（）.Aa helicopter carrying cargo onlyBa turbine-equipped helicopterCa SikorskyDa helicopter carrying injured personnel in an emergency situation
单选题
The only type of helicopter that may be refueled with the engine running and the blades turning is（）.
A
a helicopter carrying cargo only
B
a turbine-equipped helicopter
C
a Sikorsky
D
a helicopter carrying injured personnel in an emergency situation
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