● （75） means the conducting of business communication and transaction over network and through computers.（75）A. E-Mail B. E-Government C. E-text D. E-Commerce

The five general electronic commerce categories are business-to-consumer,business-to-business,business processes,consumer-to-______,and business-to-government.

A.consumer
B.government
C.business
D.customers

胰岛素等生长因子的受体被激活后表现的活性为( )。

A.Thr激酶
B.Ser激酶
C.Tyr激酶
D.Ser和Thr激酶
E.Sel、Thr和Tyr激酶

Certificates are（71）documents attesting to the（72）of a public key to an individual or other entity.They allow verification of the claim that a given public key does in fact belong to a given individual.Certificates help prevent someone from using a phony key to（73）someone else.In their simplest form,certificates contain a public key and a name.As commonly used,a certificate also contains an（74）date,the name of the CA that issued the certificate,a serial number,and perhaps other information.Most importantly,it contains the digital（75）of the certificate issuer.The most widely accepted format for certificates is X.509,thus,certificates can be read or written by any application complying with X.509.

A.connecting
B.binding
C.composing
D.conducting