单项选择题
A.不大于1mm B.不大于2mm C.不大于3mm D.不大于4mm
A.A1修 B.A2修 C.A3修 D.A4修
A.(250±6)mm B.(259±6)mm C.(260±6)mm D.(269±6)mm
A.190mm B.195mm C.196mm D.200mm
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