+2.00DC×90°与-2.00DC×180°联合后得到（）。
A: +2.00DS／-2.00DC×90°
B: +2.00DS／-4.00DC×180°
C: +2.00DS／-4.00DC×90°
D: -2.00DS／+2.00DC×90°
E: -2.00DS／+4.00DC×180°
A: +2.00DS／-2.00DC×90°
B: +2.00DS／-4.00DC×180°
C: +2.00DS／-4.00DC×90°
D: -2.00DS／+2.00DC×90°
E: -2.00DS／+4.00DC×180°
举一反三
- +2.00DC×90°与-2.00DC×180°联合后得到（）。 A: A+2.00DS／-2.00DC×90° B: B+2.00DS／-4.00DC×180° C: C+2.00DS／-4.00DC×90° D: D-2.00DS／+2.00DC×90° E: E-2.00DS／+4.00DC×180°
- Amblyopia should be suspected as a contributor to decreased visual acuity when ( ) A: Hyperopia ≥ +5.00 DS B: Myopia ≥ -10.00 DS C: Astigmatism ≥ 2.00 DC D: Difference of clyindrical diopter ≥ 1.00 DC
- ＋2.00DS／＋2.00DC*90也可表示为＋4.00DS／－2.00DC*180。（)
- +2.00DS/+2.00DC*90也可表示为+4.00DS/-2.00DC*180。
- +2.00DS/+2.00DC*90也可表示为+4.00DS/-2.00DC*180。