Choose THREE letters, A-EThe invention of different gears on a bicycle affected

游客2024-01-06  22

问题 Choose THREE letters, A-E
The invention of different gears on a bicycle affected which THREE of the following?
A Wheel size
B Balance
C Rate of speed
D The back wheel
E Safety
F Downhill travel [br]

选项

答案 D

解析
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