The only type of helicopter that may be refueled with the engine running and the blades turning is（）.<br>A:a helicopter carrying cargo only<br>B:a turbine-equipped helicopter<br>C:a Sikorsky<br>D:a helicopter carrying injured personnel in an emergency situation

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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