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【单选题】
下列属于磁屏蔽操作的是
A.
在磁体中额外放置一个线圈，其内通以与静磁场线圈电流方向相反的电流
B.
在磁体间的四壁及天花板嵌入吸音材料板
C.
磁体中的失超管设计技术
D.
磁体间的氧气监测器
E.
在磁体内壁上的不同位置，放置一定形状和尺寸的专用小铁片
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