白喉棒状杆菌的致病因素有()
A.K抗原
B.链激酶
C.白喉外毒素
D.凝固酶
E.索状因子
参考答案:A, C, E
I don't want to be ____ in this problem, which will bring me a lot of troubles. [ ]
A. suffered
B. contained
C. introduced
D. involved
松下电子的创始人是谁?()
A中村一郎
B.木村拓哉
C.松下幸之助
D.三岛由纪夫