为了推行“低碳生活”，城市街头出现了很多亲民“免费”自行车，自行车的设计用到很多物理知识，自行车刹车时，前闸车把手相当于_1（选填“省力”、“费力”或“等臂”）杠杆，刹车时是用_2方法来增大摩擦的．_刷题宝

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为了推行“低碳生活”，城市街头出现了很多亲民“免费”自行车，自行车的设计用到很多物理知识，自行车刹车时，前闸车把手相当于____（选填“省力”、“费力”或“等臂”）杠杆，刹车时是用____方法来增大摩擦的．

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答案(点此获取答案解析）

省力,增大压力的

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根据对话内容，从方框中选择恰当的选项补全对话

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