Oxygen is never used to purge an HVAC system because _____
a. oxygen will contaminate the system
b. an explosion could occur under certain conditions
c. oxygen contains too much moisture
d. oxygen is too expensive to use for that purpose
b
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Major minerals that are often lacking in animal rations are _____
a. iron c. phosphorus b. manganese d. copper
President Kennedy ordered hundreds of federal marshals and thousands of federal troops to force the racial integration of
A. Central High School in Little Rock, Arkansas. B. Louisiana State University. C. the lunch counters of Greensboro, North Carolina. D. the bus stations in Birmingham, Alabama. E. the University of Mississippi.
As a result of defeats by Napoleon, which two eastern European states abolished feudal serfdom in an effort to increase citizen loyalty?
a. Austria and Prussia b. Austria and Russia c. Prussia and Russia d. Russia and the Ottoman Empire
If a cutting plane passes through the axis of a small spring, it is drawn with the section area filled in with section lines.
Answer the following statement true (T) or false (F)