引起变态反应接触性皮炎的致敏物质多为（）

A.强刺激性物质

B.低毒性物质

C.半抗原

D.全抗原

E.强酸、强碱

An Intranet is (71) the application of Internet technology within an internal or closed user group．Internets are company and not do not have a (72) connection to the Internet．Usedproperly an Internet is highly effective corporate tool，capable of regularly (73) information toempower the workforce with the information needed to perform their roles．Used in this Way，Internet represent a step towards the (74) office．

A．painless

B．painness

C．paperless

D．paperness