Concrete-surface imperfections caused by trapped bubbles of air or water are referred to as _____
a. voids
b. bug holes
c. lapses
d. pockmarks
b
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Answer the following statements true (T) or false (F)
1) The leading cause of death in the United States of people less than 37 years of age is accidents. 2) Between 1921 and now, the number of accident deaths on the job has increased significantly. 3) Approximately 35,000,000 work hours are lost annually as a result of accidents. 4) Drowning is not a significant cause of death in workplace accidents in the United States. 5) Overexertion is a leading cause of workplace injuries 6) The rate of fatalities across all occupations fluctuates, but the rate of fatalities per year per 100,000 workers holds fairly constant over time.
The major problem with which nutrient is fixation?
A) phosphorus B) nitrogen C) ?potassium D) iron
The high-pressure fuel pumps used in gasoline direct injection (GDI) systems are powered by ________
A) Electricity (DC motor) B) The camshaft C) The crankshaft D) Electricity (AC motor)
What is the primary design challenge for CO2 refrigeration systems?
A) The high GWP of CO2 refrigerant B) CO2 refrigerant operates in a vacuum at low temperatures C) The high operating pressures of CO2 refrigerant D) The high refrigerant cost