Posttensioning of concrete slabs is used to _____.
a. reduce the amount of reinforcing steel needed
b. shorten the curing time of the concrete
c. allow the use of lower-strength concrete
d. reduce cracking under heavy load
Answer: D
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A. double-pole, single-throw B. single-pole, double-throw C. double-pole, double-throw D. single-pole, single-throw
A veces se utilizan adhesivos para sujetar el ____.
a. acero inoxidable. b. PVC c. FRP d. aluminio
Government-run farms in other countries have historically been very successful
Indicate whether the statement is true or false
What does a mixing valve do in a hydronic heating system?
A) it mixes hot water from the boiler with cold tap water B) it mixes hot water from the boiler with cooler return water C) it mixes water from two zones to return to the boiler D) it mixes cold feed water to the boiler with warmer return water