单选题To obtain accuracy in fixing by DF，（）and three stations should be used.AParallel bearingsBLong-range bearingsCShort-range bearingsDCross bearings
单选题
To obtain accuracy in fixing by DF，（）and three stations should be used.
A
Parallel bearings
B
Long-range bearings
C
Short-range bearings
D
Cross bearings
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