46 將+2.00DC×090/-2.00DC×180 轉變為正柱面形式，應為下列何者？
(A) plano/+2.00DC×180
(B)-2.00DS/+2.00DC×090
(C)-2.00DS/+4.00DC×090
(D)-2.00DS/+4.00DC×180

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統計： A(17), B(11), C(152), D(32), E(0) #2761828