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．

（75）处填（）。

A．path

B．rout

C．circuit

D．way

肝系病的肝阴不足证的治疗主方是（）

A.当归饮子

B.归芍地黄汤

C.柴胡疏肝饮

D.天麻钩藤饮

E.龙胆泻肝丸