属于伤寒杆菌抗原的是()
A."甲"鞭毛抗原
B."乙"鞭毛抗原
C."H"抗原
D."丙"鞭毛抗原
E."O"抗原
参考答案：C, E
When I said some students were so lazy, I ___to you.
A．don’t refer
B．wasn’t referring
C．didn’t refer
D．hasn’t referred
肠毒素型大肠埃希菌是
A．EIEC
B．EPEC
C．ETEC
D．EHEC
E．EAggEC
