A . 场强已达25mT/m，切换率超过120mT/m.sB . 场强已达30mT/m，切换率超过100mT/m.sC . 场强已达45mT/m，切换率超过150mT/m.sD . 场强已达60mT/m，切换率超过200mT/m.sE . 场强已达80mT/m，切换率超过200mT/m.s
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