A common substrate for green roofs, ____ can be mechanically fastened, fully adhered, or loose-laid with ballast.
A. EPDM
B. PVC
C. TPO
D. Bitumen
Answer: A
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The most spectacular forest fires occur when the entire tree burns. What is that type of fire called?
What will be an ideal response?
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Which of the following is NOT a common surface treatment for aluminum, trunk type pistons?
A. tin plating B. anodizing C. chrome plating D. annealing
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How can voltage unbalancing in the secondary of the transformer bank be nearly eliminated?
What will be an ideal response?
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The proper electrode diameter for FCAW is related to the welding machine in use and the _____
a. pipe diameter b. metal thickness c. metal density d. preheat temperature
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