knock out（基因敲除）
knock out（基因敲除）
knock out A: 敲击 B: 逃跑 C: 点头 D: 击倒，使无效
knock out A: 敲击 B: 逃跑 C: 点头 D: 击倒，使无效
knock at/on 敲knock into 撞到某人身上knock down 撞倒knock out of 把…敲出knock over 撞倒knock off 停止工作，休息1) The boxer soon knocked his opponent ________ __.2) The office stuff knocks _________ ___ at six every day.3) Try knocking __________ ___ the window and see if there is anyone indoors.4) He was so absorbed in his book that he knocked __________ _____ the car parked there.
knock at/on 敲knock into 撞到某人身上knock down 撞倒knock out of 把…敲出knock over 撞倒knock off 停止工作，休息1) The boxer soon knocked his opponent ________ __.2) The office stuff knocks _________ ___ at six every day.3) Try knocking __________ ___ the window and see if there is anyone indoors.4) He was so absorbed in his book that he knocked __________ _____ the car parked there.
He had three of his teeth _______ out in the fight. A: knocking B: knock C: knocked D: be knocking
He had three of his teeth _______ out in the fight. A: knocking B: knock C: knocked D: be knocking
名词解释基因敲除(gene knock-out)
名词解释基因敲除(gene knock-out)
发育生物学实验技术： gene knock-out？
发育生物学实验技术： gene knock-out？
Suddenly he heard someone（）gently on the window. A: knock B: knocking C: knocked D: to knock
Suddenly he heard someone（）gently on the window. A: knock B: knocking C: knocked D: to knock
A: Listen! There__________ someone __________ at the door.B: It must be your sister. A: is; knocking B: is; knock C: are; knocking D: are; knock
A: Listen! There__________ someone __________ at the door.B: It must be your sister. A: is; knocking B: is; knock C: are; knocking D: are; knock
Knock a total of ______ times. Each knock ______. A: one B: two C: three D: four E: five
Knock a total of ______ times. Each knock ______. A: one B: two C: three D: four E: five
There was a knock on the door, but _____ answered it.
There was a knock on the door, but _____ answered it.