Define potable water and describe some of the inherent problems of surface-collected water.
What will be an ideal response?
Potable (drinkable) water for public and privately owned central water systems may be obtained from rivers, lakes, ponds, surface runoff, and wells. Surface-collected water tends to contain a number of contaminates that must be removed to produce potable water. Quality problems include hardness caused by calcium and magnesium salts, discoloration caused by manganese or iron, corrosion caused by acidity in the water, pollution by sewage and organic matter, odor and taste problems caused by organic matter, and turbidity caused by silt and other suspended matter. Water treatment plants process water to correct these problems.
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The defrost timer contacts are operated by a(n) ____ that is gear-driven by an electric wall clock motor.
a. lever b. shaft c. eccentric disc d. cam
Which of the following enclosures for service conductors are required to be bonded?
A. Service raceways, cable trays and auxiliary gutters B. Meter fittings, boxes, or similar enclosures C. Any metallic raceway or armor enclosing a grounding electrode conductor D. All of the above
Which definition below most accurately defined academic freedom?
a. The freedom that accompanies being a student in college b. Students freedom to be normally offensive to those of different race, religion or sexual orientation c. Scholars freedom to express ideas without risk of official interference or professional disadvantage d. None of the above
Numerous health screens are recommended for geriatric animals. Certain screens to evaluate organ function are essential prior to administration of drugs or treatments that require normal kidney, liver, and cardiac function. For example, this is especially true for anesthetic agents that must be cleared from the system
A. True B. False