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In CMMs adequate numbers of soft keys are present. What are soft keys?

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In CMMs adequate numbers of soft keys are present. What are soft keys?

(a) Keys with variable functions

(b) Keys not hard to press

(c) Soft running keys so that less fatigue to operator

(d) Keys made of soft material

The question was asked in homework.

Question is taken from Numerical Controlled Coordinate Measuring Machines topic in portion Measuring Machines & Total Quality Management of Engineering Metrology

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Right option is (a) Keys with variable functions

The best I can explain: In CMMs which are installed with microprocessor based controls, suitable number of soft keys are provided. These keys are the keys with variable functions, which handle commands required for man-machine dialogue.

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