单项选择题限制酶切割不同来源DNA时,能产生具有相同序列的突出末端的不同片段可能方式是()
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'.()