A.聚酯逐步減少送料,長絲保持不變 B.聚酯逐步停止送料,長絲停增壓泵 C.聚酯逐步降減少送料,長絲降低增壓泵后壓力 D.聚酯逐步減少送料,長絲逐步停計量泵
A.10s B.15s C.20s D.25s