题目内容

一棵二叉树第八层(根结点为第一层)的结点数最多为【1】个。

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下面程序的执行结果是【15】 #include ＜iostream＞#include ＜iomanip＞using namespace std;void main()cout＜＜setfill(’x’)＜＜setw(10);cout＜＜"Hello"＜＜end1;

Americans usually eat three meals a day. Breakfast usually comes before eight o’clock in the morning. They usually have eggs, some meat, bread, fruit juice and coffee. Lunch, is between twelve and one o’clock. It is a light meal and working people most take lunch with them or get it near their workplace. Children in school take sandwiches, fruit, and cookies with them or eat in school. Supper, the main meal, is between six and eight in the evening. People cook it carefully. They may have meat or chicken, turkey or duck. They may all have potatoes or rice, vegetables or salad. The drink is coffee, tea or milk. Then comes the dessert. Americans have breakfast ______.

A. at eight o’clock
B. in the morning
C. before eight o’clock in the morning

[A] He is a taxi driver.[B] It’s about 1200 kilometers.[C] At seven.[D] Not far from here.[E] 200 kilometers per hour.[F] He teaches us history.[G] We learn English at school. What does your uncle do

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 (71) algorithm．Routing protocols in internetworks differ slightly from the idealized graph model．In aninternetwork，the goal of the routers to forward packets to various (72) ． Routers running RIP send their advertisement about cost every (73) seconds．A router also sends an update message whenever an update from another router causes it to change itsrouting table． It is possible to use a range of different metrics or costs for the links in a routing protocol．RIP takes the simplest approach，with all link costs being equal (74) Thus it always tries tofind the minimum hop route．Valid distances are 1 through (75) ．This also limits RIP torunning on fairly small networks．

A. distance vector
B. link state
C. flooding
D. minimum spanning tree