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单项选择题+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°

  • B
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