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【单选题】
甲、钢棒,若用甲棒的 A1 端靠近乙棒的 A2 端时,有吸引作用;若用甲棒的 A1 端靠近乙棒的中部时没有吸引作用。关于这两根钢棒,以下说法中正确的是A.
甲棒没有磁性，乙棒有磁性；
B.
甲棒有磁性，乙棒没有磁性
C.
甲、棒都有磁性
D.
甲、棒都没有磁性。
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