更多"In the following essay,each blank h"的相关试题:
[单项选择]In the following essay,each blank has four choices．Choose the best answer and writedown on the answer sheet．
Communicating via E—mail is by far the most common Internet activity．You can (71) with anyone in the world who has an Internet address or E—mail (72) with a systemconnection to the Intemet．All you need is (73) the Internet and an E—mail program．Two ofthe most widely used E．mail programs are Microsoft’s (74) and Netscape’S Navigator．Atypical E．mail message has three basic (75) ：header，message，and signature·
A. connect
B. exchange
C. communicate
D. game
[单项选择]In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. There are two types of key technology: private key and public key. Private-key encryption methods are called (71) ciphers, information is encrypted with (72) both the sender and receiver hold privately. Public-key encryption methods are called (73) ciphers, (74) created for each user, encryption key and decryption key are (75)
A. synchronous
B. Asynchronous
C. symmetric
D. asymmetric
