沙门菌的H抗原是指
A.鞭毛B.外膜蛋白C.菌毛D.菌体抗原E.荚膜抗原
参考答案:A
解析:沙门菌属抗原有O抗原、H抗原和Vi抗原,其中H抗原为鞭毛抗原,有鞭毛的细菌有此抗原。
Lucy is a very optimistic girl. ______ she is faced with difficulties, she always sees the bright side.
A.Every time
B.Now that
C.As soon as
D.On condition that
教育的基本经济特性是()。
A.加大教育投入
B.传播社会文化
C.培养劳动力
D.改革教育体制