After a concrete structure has served its original purpose, the concrete can be crushed and recycled into ____ for use in new concrete pavements or as backfill or road base.
A. cement
B. aggregate
C. fill
D. roughage
Answer: B
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Much of the hunger experienced by Confederate soldiers in the Civil War was due to
A. poor agricultural production. B. the Union's naval blockade. C. the South's rickety transportation system. D. the fact that slaves abandoned the plantations. E. profiteering by military suppliers.
If a job required three hours each time it was done and was done twice annually, and cost the company $450.00 per hour each time it was done, what error was made by the estimator who determined the total annual cost to be $1350.00?
a. failed to separate the material costs from labor b. used the wrong per hour cost c. divided instead of multiplied d. used the incorrect number of times performed
When refrigerants are exposed to glowing metal surfaces or flames:
A) Carbon monoxide is produced and should be vented. B) A respirator capable of filtering fine dust must be worn. C) Lethal phosgene gas is produced. D) Best practices require the use of proper eye protection.
Photosystem II is also called P700
Indicate whether the statement is true or false