一般在较大型的综合布线中，将计算机主机、数字程控交换机、楼宇自动化控制设备分别设置于机房；把与综合布线密切相关的硬件或设备放在（19） 。光纤电缆 需要拐弯时，其曲率半径不能小于（20） 。

单项选择题Each box is an activity; the number it contains is the duration of the activity in days. The duration of the critical path is （） .

A．16 days
B．14 days
C．19 days
D．20 days

单项选择题Which of the following is not part of a modern quality management concept （ ）

单项选择题Which of the following is not part of the quality assurance process （ ）

单项选择题The （ ） has several major components, including the system kernel, a memory management system, the file system manager, device drivers, and the system libraries.

单项选择题Which of the following elements can be called the key element of a computer （ ）