Which of the following are unsafe practices that should be avoided when using a ladder?

A. Don't lean a ladder against a unstable surface.
B. Don't rig a makeshift ladder.
C. Don't carry tool in your hands while climbing a ladder.
D. All of the above.


D

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A section of the boiler utilized to preheat feed water before it enters the main boiler system.

a. convection section b. economizer section c. radiant tube section d. shockbank

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The greatest increase in prenatal weight occurs during which trimester?

A. Middle B. Last C. First D. There is no difference during any trimester

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The mode of heat transfer that occurs when a temperature difference exists in a medium is known as

a. conduction b. convection c. radiation d. none of the above

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What defines the maximum rate of change in output voltage for a given change in input voltage?

A) differential change ratio B) slew rate C) slew ratio D) none of the above

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