A、<span style="font-size:14px;font-family:宋体">相同</span>
B、<span style="font-size:14px;font-family:宋体">相反</span>
C、<span style="font-size:14px;font-family:宋体">成45度角 </span>
D、<span style="font-size:14px;font-family:宋体">随换向器而变化</span>
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