A.≤2um B.≤2mm C.≤1.2um D.≤1.2mm
A.±10mm B.±15mm C.±20mm D.±5mm
A.75% B.50% C.90% D.60%
A.千分尺 B.直尺 C.测试笔 D.拍打
A.≥2000 B.≥2500 C.≥3000 D.≥1500
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