Locations in which flammable gases or vapors may be present in the air in quantities sufficient to produce explosive or ignitable mixtures are identified as _____.
a. Class I locations
b. Class II locations
c. Class III locations
d. Class IV locations
a. Class I locations
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X-double bar is best described as:
a. An unbiased smaller sample of a larger population used to represent the entire population. b. the average of a series of numbers. c. the average of the subgroup averages. d. the average of the subgroup averages.
Water from clean groundwater needs little pretreatment before it is suitable for use
Indicate whether the statement is true or false
In the event that GPS satellite signals are lost, the navigation system will invert to dead reckoning.
Answer the following statement true (T) or false (F)
The pitch of a thread is 0.250 inch. How far, in inches, is a nut moved in 7.5 turns?
A. 1.875 B. 1.975 C. 2.075 D. 2.175