A. 边长：100m～300m，测角中误差：5″，边长的相对中误差：1/30000
B. 边长：150m～350m，测角中误差：8″，边长的相对中误差：1/10000
C. 边长：100m～300m，测角中误差：6″，边长的相对中误差：1/20000
D. 边长：800m～200m，测角中误差：7″，边长的相对中误差：1/15000
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