The term ____ refers to a "black hole"; any data sent to this device is gone forever.

A. void
B. root
C. null
D. console


Answer: C

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What speed will a fan turn if the drive motor is turning at 1250 RPM, the motor pulley is 4 inches in diameter, and the fan pulley is 8 inches in diameter?

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When performing overhead work on scaffolding, what protective measures must be taken to prevent objects from falling and striking a person below?