When using the radar for navigating（）.
A. the best fix is obtained by using a tangent bearing and a range
B. and using two radar ranges for a fix，the objects of the ranges should be close to reciprocal bearings
C. and using ranges，the most rapidly changing range should be measured last
D. and crossing a radar range of one object with the visual bearing of a second object，the two objects should be 80°to 110°apart
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