可产生外毒素的菌群:()
A.宋内志贺菌
B.福氏志贺菌
C.鲍氏志贺菌
D.痢疾志贺菌
E.空肠弯曲菌
参考答案:D
一束光垂直射向平面镜,入射角是 ______度,反射角是 ______度.
What state is a process in when it cannot run because it needs a resource to become available
A.Ready
B.Interrupt
C.Blocked
D.Running