单项选择题X 纠错
A.10mm B.15mm C.20mm D.25mm
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单项选择题
A.1‰ B.2‰ C.1.5‰ D.2.50‰
A.15mm B.20mm C.25mm D.30mm
A.2‰ B.2.5‰ C.3‰ D.3.5‰
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
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