单项选择题
A.2.0-2.3 B.2.3-2.5 C.2.0-2.5 D.2.3-2.9
A.1.8mm B.2mm C.2.2mm D.2.5mm
A.0.1~1mm B.0.2~lmm C.0.3~1mm D.0.4~1mm
A.2~2.5 B.2.5~3 C.3~3.5 D.1.5~2
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