what is trench

 A trench is a type of excavation or in the ground that is generally deeper than it is wide, and narrow compared with its length. In geology, trenches result from erosion by rivers

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what is unix and linux

 Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged in a Linux distribution

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what is zero error

 Zero error is defined as the condition where a measuring instrument registers a reading when there should not be any reading. In case of vernier calipers it occurs when a zero on main scale does not coincide with a zero

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what is trailhead salesforce

 Learn In-Demand Skills. Get hands-on and learn the Salesforce, digital, and soft skills you need to succeed from anywhere for free. Earn Resume-Worthy Credentials. Prove your skills and earn globally-recognized credentials that demonstrate your expertise to current and future employers 

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