单项选择题
A.GB2826 B.GB2626 C.GB2829 D.GB2828
A.0.5~0.7mm B.0.5~0.8mm C.0.5~0.9mm D.0.5~1.0mm
A.0.8MM、0.2MM、0.5MM、0.75MM B.0.75MM、0.5MM、0.5MM、0.75MM C.0.5MM、0.5MM、0.75MM、0.5MM
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