判断题
错误(↓↓↓ 点击‘点击查看答案’看答案解析 ↓↓↓)
A.5mm B.10mm C.15mm D.20mm
A.1.2或1.6mm B.1.6或1.8mm C.1.8或2.0mm D.2.0mm以上
A.8mm B.12mm C.15mm D.20mm
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