A.0.2mm≤t≤0.5mm B.0.4mm≤t≤0.6mm C.0.5mm≤t≤0.9mm D.0.6mm≤t≤0.9mm
A.≥7m/s B.≥11m/s C.≥10.2m/s D.≥3m/s
A.順槳60° B.順槳30° C.順槳87° D.順槳45°