单项选择题
A.电气绝缘 B.警示标 C.无源应答器组 D.有源应答器
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
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