淋病奈瑟菌的致病因素是()
A.内毒素
B.外毒素
C.侵袭性酶
D.表面菌毛
E.鞭毛
参考答案:D
I have lost one of my gloves. I __________it somewhere.
A.must drop
B.must have dropped
C.must be dropping
D.must have been dropped
肾动脉狭窄常见的病因是()
A.纤维肌性发育不良
B.重金属肾损害
C.动脉粥样硬化
D.先天性肾小管功能缺陷
E.大动脉炎