PCR技术的标准程序中,DNA变性温度是()
A.55~59℃
B.90~99℃
C.60~71℃
D.72~89℃
E.>100℃
参考答案:B
类志贺邻单胞菌、埃希菌属的某些血清型、志贺菌属、沙门菌属和耶尔森菌属等均可引起腹泻,但不同菌属引起的腹泻表现各不相同。
能引起溶血性尿毒综合征的病原菌是()
A.痢疾志贺菌
B.伤寒沙门菌
C.EPEC
D.ETEC
E.EHEC
Many questions ________ at the meeting, but he answered none. [ ]
A. came up
B. raised
C. were risen
D. asked