Why have steel-frame structures proven more economical than conventionally formed concrete structures, especially since the 1970s?
What will be an ideal response?
As the cost of labor has increased since the 1970s, structural steel-framing systems have become more economical because they can be prefabricated in the shop and then quickly erected by relatively small fi eld crews. By contrast, cast-in-place concrete superstructures required more labor.
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Las losas de placas planas pueden volarse en una distan- cia del _____ por ciento del tramo interior.
a. 5 b. 15 c. 25 d. 30
Quick take-up master cylinders are being discussed. Technician A says this type of master cylinder keeps the pads away from the rotor. Technician B says they help increase fuel mileage. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
You have just been hired as a truck technician at a large truck repair facility. What should you do to protect your personal safety?
A. Locate the emergency eye wash station. B. Locate the MSDS information. C. Determine the location and type of fire extinguishers in the shop. D. All of the above.
A twisted pair of signal wires surrounded by a braided shield cannot be used as a type of signal cable.
Answer the following statement true (T) or false (F)