16.如图4所示是一种指甲刀的结构示意图下列说法正确的是 A.abc是一个省力杠杆 B.d处刀刃较薄可以增大压力 C.杠杆abc上有粗糙 Template




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tomski16.如图4所示是一种指甲刀的结构示意图下列说法正确的是 a.abc是一个省力杠杆 b.d处刀刃较薄可以增大压力 coloring