单项选择题
A.不小于25mm B.不小于35mm C.不小于45mm D.不小于55mm
A.(20±2)mm B.(25±2)mm C.(30±2)mm D.(35±2)mm
A.(859±3)mm B.(959±3)mm C.(809±3)mm D.(909±3)mm
A.(400±3)mm B.(500±3)mm C.(600±3)mm D.(700±3)mm
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