可判定矩阵接近奇异的条件为（ ）.

A. 矩阵行列式的值接近0
B. 矩阵的范数接近0
C. 矩阵的条件数小
D. 矩阵的元素绝对值小

A是n阶非奇异矩阵，则cond(A)( ) cond(A-1).

CM一般有两类接口，分别是与用户PC相连的（）接口和与HFC网络相连的（）接口。

Duties of the Housekeeping Department The Housekeeping Department is responsible for cleaning guest rooms and public areas such as the lobby, public restrooms and meeting rooms. It’s also responsible for performing special requests and sometimes maintai

A:Performing special requests from the guest.;
B:Keeping as many rooms as available to new guests as possible.;
C:Changing rooms for the guest.;
D:Cleaning guest rooms and public areas.;

The Housekeeping Department should contact with__________.

A:Food and Beverage Department;
B:Store Department;
C:Personnel department;
D:Front Desk;