单项选择题X 纠错
A.0-20mm B.20-80mm C.20-50mm D.20-30mm
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单项选择题
A.200m B.300mm C.400mm D.500mm
A.0.3% B.0.5% C.1% D.2%
A.7% B.25% C.27% D.30%
A.20-30mm B.30-50mm C.50-100mm D.100-200mm
A.0.2mm B.0.3mm C.0.5mm D.1mm
A.50-100mm B.100-150mm C.150-200mm方工业 D.100-200mm
A.30° B.45° C.60° D.75°
A.5m B.6m C.7m D.7.5m
A.4m B.5m C.6m D.7m
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