 9015800020 
机载或舰载重力梯度仪
Airborne or ship-borne gravity gradiometers (with an accuracy of 1 mgal or higher, steady-state recording time ≤2 minutes) |
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9015800010
机载或舰载重力仪
Airborne or ship-borne gravity meters (with an accuracy of 1 mgal or higher, steady-state recording time ≤2 minutes) |
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