A.二 B.三 C.四 D.五
A.1支 B.2支 C.3支 D.4支
A.0.2% B.0.3% C.0.4% D.0.5%
A.0.22mm≤φ≤0.35mm B.0.22mm＜φ≤0.35mm C.0.22mm≤φ≤0.30mm D.0.22mm＜φ≤0.30mm
A.4h B.12h C.18h D.24h
