题目内容
（请给出正确答案）
[主观题]
In the following essay, each blank has four choices. Choose the best answer and write down
on the answer sheet.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 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 offered and the service expected.
A．interval
B．time
C．slot
D．delay
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