A(n) ____________________ system uses water from the Earth and then, after the cycle is complete, returns the water to the Earth.
Fill in the blank(s) with the appropriate word(s).
open-loop
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What are two pruning methods commonly used for evergreens, and which one of the two is more commonly used today?
What will be an ideal response?
On average, only _____ chemicals are approved for use by agricultural producers
a. 1 in 40,000 c. 1 in 5,000 b. 1 in 20,000 d. 1 in 1,000
To ensure protection against backflow, hose bibbs are required to include _____
a. air gaps b. check valves c. vacuum breakers d. flexible water lines
Many central system chillers use water cooled condensers because
A) water cooled chillers take up less space inside the building than air cooled chillers B) air cooled condensers contribute more to global warming C) water cooled condensers require less maintenance than air cooled condensers D) the compressor can be located most anywhere inside the building