A.用相同的限制酶切割B.用识别相同靶序列的不同限制酶切割C.用识别不同序列但可产生一致的粘性末端的限制酶切割……

单项选择题下列何种细胞因子在非特异性免疫中起作用()

判断题There are 5 love stories in the movie 'Love Actually'.()

判断题10 Downing Street is a symbol of the British Prime Minister and the government.()

判断题Indians' view of the world is different from the English colonists'.()

判断题Momma, in this autobiographical account, was Marguerite’s mother.()