单项选择题
A.1.25mmB.0.080mmC.2.5mmD.5.00mm
A.≥40% B.≥35% C.≥30% D.≥25%
A.20%~80% B.20%~90% C.15%~80% D.30%~80%
A.30° B.60° C.180° D.90°
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