单项选择题
A.0.15～0.25V B.0.3～0.4V C.0.35～0.45V D.0.5～1.0V
A.正串联 B.正并联 C.反串联 D.反并联
A.360° B.210° C.180° D.120°
A.不变 B.任意变化 C.变大 D.变小
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