单项选择题X 纠错
A.2‰ B.2.5‰ C.3‰ D.3.5‰
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单项选择题
A.3根 B.4根 C.5根 D.6根
A.伸缩区 B.缓冲区 C.伸缩区和缓冲区 D.固定区
A.1~2mm B.2~4mm C.3~6mm D.4~8mm
A.45mm B.50mm C.90mm D.100mm
A.0 B.1000mm C.2000mm D.1500mm
A.3mm B.6mm C.9mm D.12mm
A.3mm B.4mm C.6mm D.9mm
A.6mm B.8mm C.10mm D.12mm
A.20m B.25m C.40m D.50m
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