Technician A says that low frequency vibrations may be heard as a moan or hum. Technician B says that high frequency vibrations may be heard as a moan or hum. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians D) Neither technician


B

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Briefly describe how concrete is made and describe its beneficial properties.

What will be an ideal response?

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The largest phylum in the animal kingdom are the _____

a. arthropods b. echinoderms c. annelids d. arachnids

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There are only a few agencies and organizations that provide updated training for safety and health managers.