There is no question that computer applications such as (71) , electronic mail, and (72) publishing have changed the way people work. These computer applications have enhanced users capacity for communication and have improved their productivity. The success of these applications has prompted both vendors and researchers to continue to seek new ways to further advance the information technology revolution. Enter the latest innovation: networked (73) systems. They convey information in multiple (74) : text, graphics, video, audio, (75) , computer simulations, and so forth. Advocates of these systems argue that they are the next logical step in human communication; however, modifying our current networks to accommodate the variety of media will present significant technical difficulties.

A．on-desk

B．tabletop

C．desktop

D．table-board

下述那一项不是血液必须在＋2℃－＋8℃保存原因（）

A、有助于红细胞的携氧能力。

B、减低红细胞葡萄糖的消耗速度。

C、抑制细菌生长。

D、有助于血液抗凝。

E、＋2℃以下红细胞易发生溶血。