通过竞争性抑制腺苷酸合成酶，使DNA合成受阻的抗病毒药物（）
A.碘苷
B.金刚烷胺
C.阿昔洛韦
D.利巴韦林
E.阿糖腺苷
参考答案：A
The following day she didn't go to the club._____, she took a short walk in the park nearby. [ ]
A. Therefore
B. However
C. Instead
D. Besides
SDH系统设备级的保护功能有：电接口保护、（）和（）。
