A.-0.001%≤比差≤-0.001% B.-0.001%≤比差≤+0.01% C.-0.025%≤比差≤+0.025%
A.±0.02%、±0.5′ B.±0.015%、±0.45′ C.±0.02%、±1′
A.±0.02%、±1′ B.±0.025%、±1.5′ C.±0.025%、±2′