11.Triangular elevator拔牙所使用的原理為下列何者?
(A)wheel-and-axle
(B)wedge
(C)third-class lever
(D)second-class lever
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統計: A(48), B(27), C(6), D(4), E(0) #3490039
統計: A(48), B(27), C(6), D(4), E(0) #3490039