单项选择题
A.1.5mm B.0.7±1mm C.2.5mm D.2mm
A.1mm B.1.5mm C.2mm D.2.5mm
A.0.4mm B.0.5mm C.0.6mm D.0.7mm
A.垂直 B.交叉 C.平行 D.斜交
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