Answer:
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4. Which type of duct undergoes more rigorous testing before it's labeled?
Answer: Flexible duct because, They also developed more than 1,000 safety criteria, some of which are... labelled goods bearing a silver UL sticker on the duct that defines this listing. ... lie in the research carried out by UL and, as a result, the authorized use of the code. Air Ducts are required to perform 15 separate tests.
Source: https://dundasjafine.com/ul-classification/
what combustion after effects do actuators work to control
Combustion after effects actuators work to control a variety of combustion after effects, including: Exhaust emissions
How to explain the informationActuators can be used to control the amount of fuel and air that is burned in an engine, which can help to reduce emissions of pollutants such as nitrogen oxides and carbon monoxide.
Actuators can be used to control the timing of the combustion event, which can help to reduce noise levels.
Efficiency: Actuators can be used to control the combustion process in a way that improves efficiency, which can save fuel and reduce emissions.
Actuators can be used to control the combustion process in a way that prevents knock, which is a destructive phenomenon that can damage an engine.
Learn more about combustion
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The map of the points and polygons of a model laid out in a 2-dimensional space is:
a tile
a UV map
a bitmap
a topography