短語詞組短語burnback resistance 抗燒能力burnback test 復(fù)燃試驗burnback time 抗燒時間burnback k resistance 抗燒能力Grain Surface BurnBack 裝藥燃面計算BURNBACK AND RE -IGNITION RESISTANCE 回火性與復(fù)燃阻力 返回 burnback