Which pozzolanic material was used by the Romans to produce hydraulic cement for aqueducts?made of natural stone and mortar consisting of lime-sand mortar?

What will be an ideal response?


Volcanic ash.

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Unless otherwise noted, the calculations in AC circuits use _____.

a. peak values b. median values c. phase values d. rms values

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A recently hired CEO (chief executive officer)wants to reduce future production costs to improve the company’s earnings, thereby increasing the value of the company’s stock. The plan is to invest $70,000 now and $50,000 in each of the next 2 years to im­prove productivity. By how much must annual costs decrease in years 3 through 10 to recover the invest­ment plus a return of 15% per year?

What will be an ideal response?

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What is the purpose of low ambient controls for air-cooled condensers?

A) To control the ambient temperature B) To maintain a maximum head pressure, even at lower-than-normal operating conditions C) To increase the fan speed to compensate for low barometric pressure D) To maintain a minimum head pressure, even at lower-than-normal operating conditions

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Which of the following is not one of the options that define the imaginary mirror plane in the 3DMIRROR command?

a. Xaxis b. XY c. Zaxis d. 3points

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