()的I/O点数是固定的,当系统不能满足要求时,通常可以扩展。
A.分体式DDC
B.分布式DDC
C.一体式DDC
D.DDC
参考答案:C
Question: Summarize the lecture and explain how specific chemicals released by animals help them identify location and attract mates.
疾病周期性的必备条件是()
A.传播机制容易实现
B.病后形成稳固免疫
C.病原体变异及易感者累积
D.人口密集、交通拥挤
E.以上都是