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下列说法8正确的是( ) A.在静电场中电场强度为零的位置,电势也一定为零 B.放在静电场中某点的检验电荷所带的电荷量q发生变化时,该检验电荷所受电场力F与其电荷量q的比值保持不变 C.在空间某位置放入一小段检验电流元,若这一小段检验电流元不受磁场力作用,则该位置的磁感应强度大小一定为零 D.磁场中某点磁感应强度的方向,由放在该点的一小段检验电流元所受磁场力方向决定
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