____ walls are masonry walls constructed of an interior and exterior wall that are connected by metal ties and separated with an air space of at least 2 in., and no more than 4½ in. in width.
A. Cavity
B. Composite
C. Reinforced masonry
D. Veneer
Answer: A
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A) The roof curb must be installed diagonal to the roof joists or rafters B) The roof curb must be square with the roof joists or rafters C) The roof joists or rafters are cut out where the curb is installed D) The plenums are fabricated in place with the roof joists or rafters passing through them
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B) The circuit number
C) Current flow in the circuit
D) The wire color