What is the main requirement for the water used in Portland cement?
What will be an ideal response?
Water used in Portland cement concrete should also be suitable for drinking. This
requires that the quantity of organic matter, oil, acids, and alkalis should not be
greater than the allowable amount in drinking water.
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Plumbing codes require the installation of reduced-pressure zone principle backflow preventer assemblies in _____.
a. swimming pools b. car washes c. landscape irrigation systems d. residences
Why did animals develop characteristics such as thick hides, long horns, or the ability to run fast?
What will be an ideal response?
The purpose of the oil filter bypass valve is to _______
A) Allow oil to bypass the filter if the filter becomes clogged B) Keep the oil from draining out of the filter when the engine is shut off C) Allows oil to bypass the oil filter when the oil is hot, to help cool the oil D) Both B and C
Which of these has the lowest dielectric constant?
A) Paper B) Vacuum C) Mica D) None of these