In the trickling filter process
a. primary effluent fIows over stones coated with microorganisms
b. raw sewage flows over stones coated with purifying chemicals
c. sewage is mixed with flocs of microorganisms and then filtered
d. secondary effluent trickles through a sand filter to "polish" it
e. none of the above
a
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Safety nets made of _____ are stronger, lighter in weight, and more resistance to wear and weather elements than the original safety nets.
A. manilla rope B. chain mail C. synthetic fibers D. natural fibers
A _____ is a flat-edge preparation that is placed at the end of a bevel joint.? ?
A. bevel? B. chamfer? C. mismatch? D. surface?
In steel erection, work cannot begin without written notification by the controlling contractor. What information must be contained in the written notification?
What will be an ideal response?
A geothermal heat pump is one in which _____
a. heat is extracted from lake water b. the heat sink is well water c. heat is extracted from air d. heat is extracted from the earth