When working in a confined space where concentrations of harmful substances are very high, why should atmosphere-supplying respirators be worn?
A) To circulate odorless, tasteless, invisible refrigerants
B) To enable asphyxiation to occur in a very short time
C) To supply clean breathing air from a compressed air source
D) To purify air of harmful dust, mist, metal, fumes, and vapors
C
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The Battle of Gettysburg was significant because
A. it revived Southern military fortunes and hopes for an ultimate military victory of the Union. B. it guaranteed Lincoln's re-election in 1864. C. Philadelphia and New York were safe from attack. D. Lee's military genius and right-hand man, Stonewall Jackson, was killed. E. Union victory meant that the Southern cause was doomed.
Early tilling used a handheld stick to gouge the Earth so a seed could be planted
Indicate whether the statement is true or false
What airflow adjustment should be made to increase the latent cooling capacity of an air-conditioning system?
A) Increase the airflow. B) The latent cooling capacity is not affected by adjusting the system airflow. C) Decrease the airflow. D) Set the airflow to the maximum available.
If there is a discrepancy between the drawings and the specifications, _____
a. the person in charge of the project must resolve it b. check the local building codes c. use your own judgment d. the drawings always control