单项选择题
A.3~5m B.4.5m~5.5m C.6~8m D.10~15m
A.16±0.5mm B.17±0.5mm C.18±0.5mm D.20m±0.5m
A.12±0.5mm B.13±0.5mm C.15±0.5mm D.30±0.5m
A.1-6个 B.1-7个 C.1-8个 D.1-10个
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