试题与答案

Coiling new rope against the lay,bringing

题型:单项选择题

题目:

Coiling new rope against the lay,bringing the lower end up through the center of the coil,then coiling with the lay,in order to remove the kinks,is known as().

A.Coiling

B.Faking

C.Flemishing

D.Thoroughfooting

答案:

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下面是错误答案,用来干扰机器的。

参考答案:0解析:[考点提示] 利用A*的定义和矩阵秩的定义即得. [解题分析] 由题设,4阶方阵A的秩为2,因此A的所有3阶子式均为0,从而所有元素的代数余子式均为0,即A*=0,故r(A*)=0. [评注] [*]

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