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．physical

B．psycological

C．spatial

D．soirted

减免税货物和保税货物均属于海关监管货物，经营者均需承担有关法律义务。但海关对前者实行时效管理，对后者实行核销管理。 ( )