【单选题】
Generally, runaway means such situation when the speed main engine exceeds the rating speed by its ()
A、10%
B、15%
C、20%
D、5%
A、10%
B、15%
C、20%
D、5%
A、predicted in Tidal Current Tables B、unpredictable C、
A、
A、the most common method used in the United States B、too expensive for common use C、