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A longitudinal wave is a wave of which the disturbance direction is the same direction of the direction of the wave. Waves done in a spring and sound wave
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Why the metal strip should be flat or wire be kink free in screw gauge?</<br>
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if the strip will flat we can measure its thickness easily but if it is not flat i.e. its surface is irregular then it will thick only from some points and 카지노사이트
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How often must food contact surfaces that do not come into contact with PHF foods be cle

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