15.使用牙根尖挺(root tip pick或apex elevator)將齒槽內殘餘的牙根尖拔除時,所採用的力學原理為何?
(A)lever
(B)wheel and axle
(C)wedge
(D)axle
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統計: A(125), B(103), C(439), D(6), E(0) #1634201
統計: A(125), B(103), C(439), D(6), E(0) #1634201