我国正式公布了电子签名法，数字签名机制用于实现（）需求。
A.抗否认
B.保密性
C.完整性
D.可用性
参考答案：A
Many journalists were sent to ________ the terrible disaster immediately the earthquake broke out in Sichuan Province on May 12th,2008.
A．interview
B．investigate
C． catch
D．cover
气分证涉及的病变部位有（）
A.肺
B.脾胃
C.膜原
D.肠
E.胸膈
