单项选择题
A.G27 B.G52 C.G03 D.G92
A.1/2 B.1/3 C.1/4 D.1/5
A.G90 B.G96 C.G92 D.G91
A.1.6~12.5mm B.0.8~6.3mm C.0.8~1.6mm D.0.1~1.6mm
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