| {{B}}
Text{{/B}} Today, most countries in the world have canals. Many countries have built canals near the coast, and parallel {{U}} (26) {{/U}} the coast. Even in the twentieth century, goods can be moved more cheaply by boat than by any other {{U}} (27) {{/U}} of transport. These {{U}} (28) {{/U}} make it possible for boats to travel {{U}} (29) {{/U}} ports along the coast without being {{U}} (30) {{/U}} to the dangers of the open. Some canals, such as the Suez and the Panama, save ships weeks of time by making their {{U}} (31) {{/U}} a thousand miles shorter. Other canals permit boats to reach cities that are not {{U}} (32) {{/U}} on the coast, still other canals {{U}} (33) {{/U}} lands where there is too much water, help to {{U}} (34) {{/U}} fields where there is not enough water, and {{U} A. lain B. stationed C. set D. located 更多"{{B}} "的相关试题: [多项选择]已知A=E+αβT，其中α=(a1,a2,a3)T，β=(b1,b2,b3)T且αTβ=2
(Ⅰ)求矩阵A的特征值与特征向量； (Ⅱ)证明A可逆，并求A-1； (Ⅲ)求行列式|A*+E|的值. [填空题]设F是T1、T2和T3三棵树组成的森林，与F对应的二叉树为B， 已知T1、T2和 T3的结点个数分别为n1、n2和n3，则二叉树B的根结点左子树个数为 ______。
[简答题]已知A=E+αβT，其中α=(a1，a2，a3)T，β=(b1，b2，b3，)T，且αTβ=2．
证明A可逆，并求A-1； [单项选择]
A. a+2b+10c B. 10a+20b+x C. 10(a+2b+c. D. 100(a+26+c. E. 100a+20b+c [单项选择]若关系R和S，T如下图所示，则是执行了哪种操作才得到T S
|
