单项选择题
A.10mm B.15mm C.25mm D.35mm
A.20~30mm B.25~35mm C.30~35mm D.30~45mm
A.(400±3)mm B.(500±3)mm C.(600±3)mm D.(700±3)mm
A.(859±3)mm B.(959±3)mm C.(809±3)mm D.(909±3)mm
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