多元可燃性混合气体
poly-ingredient flammable mixed gases
活性气体保护电弧焊
metal-active gas arc welding
metal active-gas welding[LM
双丝脉冲熔化极活性气体保护焊
double-wire pulse metal active gas welding
完全混合活性污泥法
complete mixing activated sludge process
子宫恶性混合性中胚叶肿瘤
uterine malignant mixed mesodermal tumor
c-C4F8和CF4混合气体
c-C4F8 and CF4 hybrid gas