引起脊髓灰质炎的病原体为
A.脊髓灰质炎病毒
B.肠道病毒
C.柯萨奇病毒
D.腮腺炎病毒
E.腺病毒
参考答案:A
A(n) _________ in information technology is taking place around the world as a result of fierce
competitions. [ ]
A. revolution
B. application
C. protection
D. reception
电捕焦油器前煤气吸力()