距单位磁极厘米处的磁场强度。
用来测量地球磁场强度和方向的仪器。
An instrument used to measure the strength or direction of the Earth's magnetic field.
所有的金属在磁场强度更大的缺口磁极位置。
All its metal pole pieces in place for higher gap field strength.
所有的金属在磁场强度更大的缺口磁极位置。
All its metal pole pieces in place for higher gap field strength.
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