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问题 选择题

有关右图中的描述正确的是（　　）

A．a是入射光、b是反射光、c是折射光、QP是法线

B．a是入射光、b是反射光、d是折射光、QP是法线

C．a是入射光、e是反射光、c是折射光、MN是法线

D．a是入射光、b是反射光、e是折射光、QP是法线

答案

答案：B

单项选择题

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.

Open Shortest Path First (OSPF) is a (1) routing algorithm that (2) work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (3) processing power. The (4) algorithm is used to calculate routes. OSPF routing table updates only take place when necessary, (5) at regular intervals.

1（）

A．distance-vector

B．link-state

C．flow-based

D．selective flooding
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填空题

YZ-1型制动机自动阀下的调压阀失去调压作用，当操纵空气制动阀（大闸）手把到充风位，会造成均衡风缸和列车管与（）相同。
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