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问题 多项选择题

空调系统中，双风管集中式系统的特点有( )。

A．设备简单、初投资省

B．每个房间可以分别控制

C．可在同一系统内实现需要的加热或冷却

D．室温调节反应极为迅速

答案

参考答案：B,C,D

单项选择题

In low-speed network，it is usually adequate to wait for congestion to occur and then react to it bytelling the source of packets to slow down．In high-speed networks，this approach often works poorly，because in the (71) between sending the notification and notification arriving at the source，thousands of additional (72) may arrive．In ATM network，a major tool for preventing (73) is (74) control．When a host wants a new virtual (75) ，it must describe the traffic to be offeredand the service expected．

（72）处填（）。

A．packets

B．cells

C．message

D．files
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单项选择题

《发展循环经济建设生态文明》提到，“人口必须要控制”这个基本的经济学规律是由（）提出。

A.马寅初

B.邓 * *

C.周恩来

D.刘 * *

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