Brown and red colors in subsurface horizons are caused by ________ in the soil
A) clay
B) manganese
C) organic matter
D) iron oxides
E) aluminum oxides
D
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Repointing should be started when the existing mortar joints are eroded or exposed to a depth of _____ .
A. no more than ¼" B. at least ¼" C. ½" or more D. at least 1"
Drum brakes are typically found on the rear wheel.
Answer the following statement true (T) or false (F)
Contaminants that can be found in recovered refrigerant include:
A) Carbon and particulates. B) Oil and noncondensables. C) Water and acid. D) Carbon, oil, noncondensables, water, and acid.
Why should oxygen tank valves be fully opened when in use?
A. To provide sufficient oxygen pressure. B. To prevent inadvertently increasing oxygen after a flame is set. C. It will prolong the service life of the valves. D. Oxygen will leak past valve threads on a partially opened valve.