根据下面的文字资料回答 63~67 题 In low-speed network,it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down.In high-speed networks,this approach oftenworks poorly,because in the( 1 )between sending the notification and notification arriving at the source,thousands of additional( 2 )may aITive.In ATM network,a major tool for preventing( 3 )is( 4 )control.when a host wants a new virtual( 5 ),it must describe the traffic to be offered and the service expected. 第63题:文中( 1 )处正确的答案是( )。 A.interval B.time C.slot D.delay