Because concrete is heavy, doing stretching exercises before working with it will help prevent _____.

a. sore arms
b. leg cramps
c. strains and sprains
d. bruises

Answer: C

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Which type of glass is commonly used in drive-in bank windows?

A) Laminated glass B) Annealed glass C) Heat-strengthened glass D) Tempered glass

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Concrete normally attains its design strength in about _____.

a. 14 days b. 21 days c. 28 days d. 30 days

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Which of the following is not a type of variable resistor?

A) thermistor B) photoconductive cell C) potentiometer D) All are types of variable resistors.

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OSHA publishes guidelines for general safety and health program management that