关于绩效衡量问题的视角下列说法正确的有( )。

A．与实务方法不同，理论上对基金绩效表现的衡量以各种风险调整收益指标以及各种绩效评估模型为基础

B．短期衡量通常是对近2年表现的衡量，而长期衡量则通常将考察期设定在2年(含)以上

C．微观绩效衡量主要是对个别基金绩效的衡量，而宏观衡量则力求反映全部基金的整体表现

D．基金衡量侧重于对基金本身表现的数量分析，而公司衡量则更看重管理公司本身素质的衡量

Asynchronous Transfer Mode (ATM) is a (16) that promises to change the fabric of local and wide area communications.

The key advantage of ATM is the capability to move voice, data, graphics and (17) at speeds of up to 2 gigabits per second.

An ATM switch allows you to create a (18) network that is completely independent from the (19) configuration of the network.ATM uses a (20) called cell switching to convert data into fixed length cells of 53 bytes each, so they can be switched very quickly and efficiently.

（20）是（）

A. technology

B. video images

C. logical

D. technique