Unlike poll(), the pollset interface does not require the selector to copy the entire file descriptor set each time when select() is called.
与poll() 不同，pollset接口并不要求选择器在每次调用 select()时复制整个文件描述符集。
Each time a segment selector is loaded on to segment registers, the corresponding segment descriptor is loaded from memory into a matching non-programmable CPU register.
每次将段选择器加载到段寄存器中时，对应的段描述符都会从内存加载到相匹配的不可编程CPU寄存器中。
Selector switch module output to be taken into consideration at the same time connected to the number of output points.
选择开关量输出模块时，还应考虑能同时接通的输出点数量。
The standard date selector on the right side of the dialog allows you to enter the date and time for which the ground track display should start;
对话框左边的选择框用于输入所要显示的地面轨道的开始时间；
The standard date selector on the right side of the dialog allows you to enter the date and time for which the ground track display should start;
对话框左边的选择框用于输入所要显示的地面轨道的开始时间；
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