The other integral part of our research is differential frequency hopping (DFH) communication system.
本课题的另一个主要研究内容是差分跳频通信系统。
参考来源 - 基于MAP检测的差分跳频通信系统最佳接收方案研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The first example, written in PHP, will capture the output of the shell command "df -h," place the output into an array, and then examine each line of output against a regular expression.
采用PHP编写的第一个示例将捕获Shell命令“df—h”的输出，将输出放在一个数组中，然后根据一个正则表达式检查输出的每一行。
This output is very different from the previous — flagged — version, because it is just the unfiltered results of df -h with a print statement injected at the top.
此输出与前面带标记的版本区别非常大，因为它只是使用顶部注入的print语句来打印的未经筛选的df—h命令结果。
Df -h also shows how the disk was partitioned.
df - h还会显示磁盘的分区情况。
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