您要查找的是不是：
- Using the strong background magnetic field produced by effective electromagnet and the catching surface to produce high magnetic field gradient makes the separation of micro-grade material possible. 利用有效电磁体产生的强背景磁场和能产生高磁场梯度的捕集表面,使得分选微米级的物料成为可能。
- It is showed by the experimental results that the influence of the background magnetic field is mostly eliminated, the precision is improved, and the stability of the gradiometer circuitry is good. 试验数据表明，背景磁场的干扰得到有效的消除，从而提高测量精度，且电路的稳定性能良好。
- Discussion on Background Magnetic Field Control in Metal Magnetic Memory Testing 关于金属磁记忆检测中背景磁场抑制的讨论
- It shows the presence of a magnetic field. 这表明有磁场存在。
- Background magnetic field 背景磁场
- ocean background magnetic field 海洋背景磁场
- Can Magnetic Field Drill through a Piece of Iron? 磁场能穿过铁片吗?
- The string is in a magnetic field. 振动弦处于磁场之中。
- The force exerted by a magnetic field. 力由磁场施加的力。
- The lines of force of a magnetic field. 磁力磁场的磁力线
- The distance at which the magnetic field from the line becomes indistinguishable from typical background levels differs for different types of lines. 要使输电线产生的电磁场辐射等级和典型的背景电磁辐射等级差不多，这个距离得随输电线的不同而变化。
- The class of phenomena exhibited by a magnetic field. 磁性磁场显示的一组现象
- The current in the conductor sets up a magnetic field. 导体里的电流形成一个磁场。
- A third radiation group was unaffected by the magnetic field. 第三组射线不受磁场的影响。
- The magnetic field of the earth creates a torque around the pivot. 地球的磁场在支点周围产生一个转矩。
- We might put the current-carrying wire in a magnetic field. 我们可将载流导线置于磁场中。
- The stronger the magnetic field,the more current is generated. 磁场越强，发出的电流就越多。
- Don't bend or stain and avoid magnetic fields. 不要弯折、污损，并避开磁场。
- Magnetic fields creating dynamic sculptures. 磁场造成的动态条纹。
