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问题 单项选择题

第一萃取塔塔底反丁烯-2不合格时正确的调整措施为（）。

A.增大溶剂比

B.减少溶剂量

C.减少压缩机返回量

D.增大第二萃取塔进料量

答案

参考答案：B

单项选择题

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.

（18）是（）

A. technology

B. video images

C. logical

D. physical
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单项选择题

IPv4协议头中标识符字段的作用是（）。

A．指明封装的上层协议

B．表示松散源路由

C．用于分段和重装配

D．表示提供的服务类型
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