Bicycle Crank(自行车曲柄),Bicycle Crank(自行车曲柄)厂家供应信息, Bicycle Crank(自行车曲柄)出厂价格...
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bicycle chainwheel and crank 自行车链轮曲柄
Bicycle crank arm 发明名称
bicycle e chainwheel and crank 自行车链轮曲柄
Bicycle chainwheel & crank 自行车链及曲柄
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Men operating a bicycle crank pump refuel cars at the site of a gas station in the earthquake- and tsunami-destroyed town of Minamisanriku, northeastern Japan. (AP Photo/David Guttenfelder)
日本东北部，被地震和海啸摧毁的南三陆町市。人们在一个加油站边运行一个脚踩曲轴泵给汽车加油。
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