缺损突变体，缺陷突变型，缺陷突变株

大肠杆菌astE、rph基因敲除突变株的构建

四氢嘧啶吸收缺陷突变株高效制备四氢嘧啶

defective

defective product

defective rate

defective

lot tolerance percent defective【经管】

defective goods【工经】;degraded product【工经】;substandard goods【工经】

automatic cut-off valve for defective pipe

lot tolerance per cent defective