题目：
图所示的四种用具中，属于费力杠杆的是（ ）
A．
用镊子夹取物品
B．
用钳子绞铁丝
C．
用剪刀剪毛线
D．
用起子开瓶盖
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
图所示的四种用具中，属于费力杠杆的是（ ） A． 用镊子夹取物品 B． 用钳
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