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【单选题】
一个细螺绕环中心线的直径为40 cm (远大于线圈的直径)，并载有2.5 A的电流，如果中心处的磁感应强度万【图片】T，则该螺绕环单位长度所绕线圈的匝数为
A.
63
B.
126
C.
252
D.
100
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