单项选择题
A.1/1000 B.0.1/1000 C.0.02/1000 D.0.03/1000
A.10% B.15% C.20% D.30%
A.2mm B.3mm C.5mm D.10mm
A.无声响 B.无松动现象 C.无脱落 D.无破损
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