declination compass 磁差仪; 磁偏计; 磁偏针; 倾角计 declination constant 固有磁偏; 固有偏磁 .
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磁针偏差计 declinometer
磁针偏差 Aberration of needle ; needle aberration ; magnetic declination
偏转磁强针 deflection magnetometer
磁偏指针 declination needle
磁针偏角 declination of the needle ; magneticneedledeclination ; magnetic needle inclination
当地磁针偏差 local magnetic deviation ; local magnetic deviation west bank
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