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【单选题】
现将电池组、滑动变阻器、带铁芯的线圈 A 、线圈 B 、电流计及开关按如图 1-1-7 所示连接。下列说法中正确的是 ( )
A.
开关闭合后 , 线圈 A 插入或拔出引起电流计指针偏转
B.
线圈 A 插入线圈 B 中后 , 开关闭合和断开的瞬间电流计指 针均不会偏转
C.
开关闭合后 , 滑动变阻器的滑片 P 匀速滑动 , 会使电流计指 针静止在中央零刻度处
D.
开关闭合后 , 只有滑动变阻器的滑片 P 加速滑动 , 电流计指针才能偏转
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A.
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