A.≥lmm B.≥2mm C.≥3mm D.≥4mm
A.52mm B.55mm C.58mm D.62mm
A.80mm B.90mm C.100mm D.ll0mm
A.1~2g/s B.2~3g/s C.1~2kg/min D.2~3kg/min
A.l段 B.2段 C.3段 D.4段