单项选择题
A.0.5mm B.1mm C.1.5mm D.2mm
A.＞0.5mm B.＞0.6mm C.＞0.7mm D.＞0.8mm
A.9±1mm B.3±1mm C.5±1mm D.7±1mm
A.340mm×50mm×16mm、R420mm B.340mm×60mm×16mm、R440mm C.340mm×60mm×16mm、R420mm
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