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问题 单项选择题

会计凭证按其( )不同，可以分为原始凭证和记账凭证两类。

A．反映业务的方法

B．填制方式

C．取得来源

D．填制的程序和用途

答案

参考答案：D

解析： 会计凭证按其填制的程序和用途不同，可以分为原始凭证和记账凭证两类。

单项选择题

One of the most widely used routing protocols in IP networks is the Routing Information Protocol (RIP)．RIP is the canonical example of a routing protocol built on the (1) algorithm．Routing protocols in internet works differ slightly from the idealized graph model．In an internet work，the goal of the routers to forward (2) to various networks．

Routers running RIP send their advertisement about cost every (3) seconds．A router also sends an update message whenever an update from another router causes it to change its routing table．

Routing protocols use different techniques for assigning (4) to individual networks．Further, each routing protocol forms a metric aggregation in a different way．RIP takes the simplest approach，with all link costs being equal (5) ．Thus it always tries to find the minimum hop route．Valid distances are 1 through 15．This also limits RIP to runing on fairly small networks．

5（）

A．1

B．15

C．16

D．length of the link
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单项选择题

冬小麦营养最大效率期在（）

A.冬前

B.返青期—起身期

C.起身期—拔节期

D.拔节期—抽穗期
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