单项选择题
A.1 B.2 C.3 D.4
A.ECTS-27 B.ECTS-21 C.ECTS-5 D.ECTS-41
A.30m±0.5m B.35m±0.5m C.40m±0.5m D.45m±0.5m
A.100m±0.5m B.150m±0.5m C.200m±0.5m D.250m±0.5m
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