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The preparatory functions in Computer Numerical Controlled (CNC) machine programming are denoted by the alphabet

1. G
2. M
3. P
4. O

Correct answer: G

Solution

In CNC programming, preparatory functions, which control the movement and operation of the machine, are designated by the letter 'G'. These codes instruct the machine on how to perform specific tasks, such as linear interpolation or circular interpolation.

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