恶意对手可能试图破坏鉴别机制,会进行的破坏攻击包含下列哪种()
A.交换攻击
B.反复攻击
C.插入会话攻击
D.假冒攻击
参考答案:D
—How tired he looks!
—Yes. He spends____time____his work.[ ]
A. a lot, in
B. many; with
C. too much; on
D. too much, in
医院管理工作职能有哪些?