Answer and Explanation: 
Omnidirectional antenna are those antennas which receives the signals from multiple directions equally.These are the antennas that cannot  get the signal from a particular direction thus gives the low throughput.
To get high throughput, directional antennas should be installed because they receive the signal from a particular direction only .Thus the signal received from these antenna work for a certain area.Example-Television antenna at homes are directional antennas names as Yagi-uda antennas.
 
        
             
        
        
        
Answer:
ummmm try the inequality protragathron theorum 
Explanation:
ok
 
        
             
        
        
        
Answer:
1. DLL Files. 
2. System software repair. 
3. Software configuration. 
4. Human-computer interaction. 
5. A graphical user interface (GUI). 
Explanation:
1. DLL Files can become lost or damaged on a computer and prevent it from working correctly. These are important registry files used by various system softwares to perform specific tasks. 
2. System software repair is a type of software you can run to help fix computer problems. Some examples are disk defragmenter, regedit, etc. 
3. Software configuration means the process of setting up an application and selecting specific options. This is usually done in the settings section of a software application or program. 
4. Human-computer interaction is the name of the discipline concerned with the design of optimal user interfaces. 
5. A graphical user interface (GUI) is what users make use of to interact with graphical icons and other visual elements in order to accomplish tasks. 
 
        
             
        
        
        
Answer: The most important characteristic for the development of a civilization is the presence of advanced cities because they were centers of trade, which established economies and allowed for further development of the civilizations.
Explanation:
Your welcome :)
 
        
             
        
        
        
A network operating system is basically a computer operating system that is designed to support a workstation, and other machines that are connected in the Local Area Network. It allows access to a certain devices and machines like printer, file sharing, etc.