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1. What comes after wheel less cars will
1. C 2. D 3. A 4. B 5. B
2. Who can provide various professional terms for vacuum cleaners
The following are English words about vacuum cleaner vocabulary ABS Plastics Acrylonitrile-butadiene-styrene plastics are used extensively in the molding of vacuum cleaner cases and trim parts. It is an economical plastic which is lightweight but strong and resists stains and chemicals. See also our article on External Structure Materials & Durability Activated Charcoal Charcoal from which most of the impurities have been removed. It is made by treating ordinary charcoal with steam and air heated to above 600 degrees Fahrenheit. It is the best adsorbent since its many empty spaces give it a large internal surface to hold particles. Agitation The process of moving in a rapid and violent manner. Carpet is usually agitated by the brushes and sometimes a beater bar on the revolving brush roll in a vacuum c leaner. See also our article on the Effects of Brushing Action. Air Flow The movement of air from one location to another. In a vacuum cleaner, it generally refers to the movement of air through the vacuum cleaner or central vacuum system and is measured in cubic feet per minute (C.F.M.). It is one of the most important aspects of vacuum cleaner performance. Air flow in a vacuum cleaner is inversely proportional to the total resistance within the system and directly proportional to the suction created by the suction motor. For additional information, see our article on Air Flow through the System. Air Pressure The pressure of atmospheric or compressed air. At sea level, atmospheric pressure is 1, 013.2 millibars or 14.69 pounds per square inch. A vacuum cleaner"s sucti


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