Engineering Drawing
Most architectural firms and mechanical design companies utilize different categories of blocks. These sets of blocks are usually housed in _________.

Block libraries
Block references
Block vaults
Block books

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Engineering Drawing
Three dimensional models are often used in the design process to ________.

Determine the quantity of brick needed to build the house
Help the client understand the overall design concept
Help the client select a color for their carpet
Provide the client with a model which they can use to impress their friends

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