单项选择题
A.±30mm B.±50mm C.±100mm D.±200mm
A.±300mm B.±100mm C.±150mm D.±200mm
A.±1mm B.±1.5mm C.±2mm D.±2.5mm
A.2.5m B.3.5m C.4.5m D.5.5m
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