The solder most commonly used on low-pressure copper fittings is made from _____
a. 100% lead
b. 50% tin/50% silver
c. 95% tin/5% antimony
d. 45% silver/25% zinc/30% copper
c
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?When a filler is submicron in size, it is termed ____.
A. ?a nanocomposite B. ?isotropic C. ?inert D. ?anisotropic
List the nine categories used for botanical classification and provide an explanation for each one
What will be an ideal response?
List the five steps used to sketch a circle.
What will be an ideal response?
Why did the development of 80 percent efficient furnaces using draft-inducer fans present a problem for venting tables?
A) The draft-inducer fans required the use of a larger vent. B) The inducer fan cooled the air, and a smaller vent was required to prevent condensation. C) The fan heated the air too much for standard venting. D) The use of natural-draft and draft-induced furnaces had little impact on venting tables.