What are some current uses of genetic engineering?
What will be an ideal response?
Genetic scientists have been able to develop plants that are resistant to herbicides. They
also have developed the ability to exactly locate the parts of the genes that control
certain characteristics.
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Why must electrical contacts never be permitted to open or close too slowly?
What will be an ideal response?
What types of drawings are required for steel frame construction?
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. A rectangular area of building that is bounded on all three sides by exterior walls, on the fourth side by a fire barrier, and with fire-rated floors above and below, may be treated as a fire area. 2. Compared to a lightweight building element, a heavyweight element is generally a poor transmitter of airborne sound. 3. A resilient clip consists of a small light-gauge steel member with a rubber pad fastened to it. 4. A resilient channel is used to attenuate airborne sound, whereas a resilient clip is used to attenuate structure -borne sound. 5. A seismic joint is generally similar to a building expansion joint but smaller in width.
Optional components found on the low side of a refrigeration system include:
A) Suction to liquid heat exchanger, economizer, and oil level regulator. B) Suction line filter, accumulator, and evaporator pressure regulator. C) Discharge line muffler, oil separator, liquid receiver, and liquid line filter-drier. D) All optional components can be used on the low side of the system.