问题
单项选择题
+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°
答案
参考答案：B
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+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°
参考答案：B