The most common water treatment filters use activated ____, a block of porous mineral that is effective at removing contaminants from water that passes through it.
A. carbon
B. silicon
C. sulfate
D. phosphate
Answer: A
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Which structural materials (i) undergo both thermal expansion and thermal contraction during service, and which materials (ii) undergo only moisture expansion (no moisture shrinkage) during service?
What will be an ideal response?
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An electronic variable speed drive has two basic sections: the control section and the power section.
Answer the following statement true (T) or false (F)
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The conversion of stored food into usable energy by the flower is called
a. photosynthesis c. xylem b. transpiration d. respiration
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Why is it possible to vary the output voltage by controlling either the speed of the prime mover or the strength of the magnetic field?
What will be an ideal response?
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