21.病人的左眼處方是+5.50DS/-5.50DC×90,改寫為正柱面透鏡處方時應是:
(A)+2.25DS/+5.50DC×90
(B)0DS/+5.50DC×90
(C)+2.25DS/+5.50DC×180
(D)0DS/+5.50DC×180
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統計: A(0), B(0), C(1), D(0), E(0) #3987118
統計: A(0), B(0), C(1), D(0), E(0) #3987118