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．

（74）处填（）。

A．flow

B．admission

C．traffic

D．time

应用Apgar评分法，错误的说法是（）

A.心率120次／min、规律得2分

B.呼吸浅慢且不规律得2分

C.肌张力松张弛得1分

D.刺激咽喉出现咳嗽、恶心得1分

E.皮肤青紫得O分