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【单选题】
+2.00DC×90°与-2.00DC×l80°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°
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A.
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B.
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C.
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