题型:填空题 Would you please pass me the knife ____?A.to cut the watermelon withB.to cut the watermelonC.cutting the watermelonD.cutting the watermelon with 查看答案
题型:填空题 基因工程操作的三大基本元件是()I供体;II受体;III载体;IV抗体;V配体A、I+II+IIIB、I+III+IVC、II+III+IVD、II+IV+VE、III+IV+V 查看答案