Describe the two classifications of slate roofing.
What will be an ideal response?
Slate roofing is divided into two classifications: textural (or random) and standard commercial. Textural slate is delivered to the job site in a range of thicknesses and sizes and must be sorted by roofers. Standard commercial slate is graded at the quarry by thickness, length, and width, with thicknesses of usually 1/4 in. (6 mm).
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Figure 41-02
In the accompanying figure, because control relay CR is used as a(n) ____________________, it must be permitted to remain energized when either or both of the motor starters are not energized.
Fill in the blank(s) with the appropriate word(s).
For ______________________________, life cycle analysis and environmental impact are especially important factors.
Fill in the blank(s) with the appropriate word(s).
What is the vertical distance between the centerline of a pump and the surface of the liquid on the discharge side of the pump?
A. Head B. Total head C. Discharge static head D. Suction static head
To remove stain from fingernails, use:
What will be an ideal response?