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问题 解答题

一根电线，用去3三.8它米，比剩下的多8.七七米，这根电线长多少米？

答案

12.57-5.99+12.57

=21.55+12.57

=图2.7图（米）

答：这根电线长图2.7图米．

多项选择题

以下关于脚手架表述正确的是（）。

A.外脚手架如仅用于砌筑者，按外脚手架相应子目，定额乘以系数0.625

B.同一栋建筑物内有不同高度时，应按最大高度列项计算外脚手架

C.砌筑高度超过1.2m以上的，均需计算脚手架

D.里脚手架按内墙净长乘以实砌高度计算

E.电梯井按井底板面至顶板面高度，以座计算
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单项选择题

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.

71（）

A．interval

B．time

C．slot

D．delay
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