The commutative law of Boolean addition states that A + B = A ? B
Indicate whether the statement is true or false
FALSE
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When planning the installation of jacket on any piping run, what is the main thing to keep in mind for the sequence of section installation?
a. Whole sections should be installed before cut sections. b. Start at walls and work toward the middle of the pipe run. c. Jacket the pipe run except for brackets, then go back and do the brackets. d. Place the jacket seams in a sequence so they will always shed water.
HD-5 LPG is made with 5% propane and 95% butane.
Answer the following statement true (T) or false (F)
After determining the pH of the soil in a landscape is high, it is recommended to:
A. use plants that are adapted to that pH. B. use fertilizers that can change the pH so low pH plants can be grown. C. have a an inch or two of the old soil removed and replaced with soil with a better pH. D. do nothing, most plants can adapt to a high pH.
In astable operation, the time period of the 555 timer output is expressed as
A) tw = tLO + tHI B) tw = R(.693 ) C) tw = RextCext D) tw = Rext + Rint