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问题 单项选择题

TCP/IP参考模型在网络层定义了

A．IP协议

B．TCP协议

C．UDP协议

D．FTP协议

答案

参考答案：A

解析： IP是网络层协议，TCP和UDP是传输层协议，FTP是高层协议。

单项选择题

In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private key can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secret key.

（71）是（）

A.binarytext

B.hypertext

C.plaintext

D.supertext
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单项选择题

26岁，月经规律，停经50天，少量 * * 出血6天，偶有腹痛。妇科检查：宫颈软，宫体稍大而软，附件无异常。该病人最可能的诊断是（）

A.功能性子宫出血

B.子宫肌瘤

C.宫外孕

D.先兆流产

E.子宫内膜炎
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