20. 為得到 Optimum Visibility 牙醫師操作時之 vision and illumination 下列何者最理想?
(A)Direct vision and direct illumination
(B)Direct vision and indirect illumination
(C)indirect vision and direct illumination
(D)indirect vision and indirect illumination
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統計: A(2), B(0), C(0), D(0), E(0) #3493073
統計: A(2), B(0), C(0), D(0), E(0) #3493073