January 2019 1 173 Report
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A ceiling fan is a mechanical fan. It is usually electrically powered and it is suspended from the ceiling of a room. It also uses hub-mounted rotating paddels to calculate air.
Ceiling fans rotate much more slowly than an electric desk fan. They cool people effectively by introduce slow movement into the otherwise still, hot air of a room, inducing evaporative cooling. Unlike air conditioners, fans only move air-they do not direcly change its temperature. Some ceiling fans have adjustable blade pitch instead of reversible motor.
Answer the following questions.
1. "It is usually electrically powered". What does "it" refer to?
2. Why do we use the pronoun "it"?
3. "They cool people effectively...." What does "they" refer to?
4. When do we use the pronoun "they"?
5. "Some ceiling fans have adjustable blade pitch instead of reversible motor." What does "reversible" word mean?
6. Do all ceiling fans have adjustable blad pitch? Why/why not?
7. So what is the use of "some" in this sentence?
8. Can we change "some" with "most" or "all"? What do the sentence mean, then?
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Please help me!!Plasma display panel (PDP) is a type of flat panel display common to large TV displays 30 inches (76 cm) or larger. They are called "plasma" displays because the technology utilizes small cells containing electrically discharged ionized gases, more commonly known as fluorescent lamps.Plasma display are bright, have a wide color gamut, and can be produced in fairly large size up to 3.8 meters diagonally. They have a very low-luminance "dark room" black level compared with the lighter grey of the unilluminated parts of an LCD screen. The display panel itself is about 6 centimeters (2.4 inches) thick.Power consumption varies greatly with picture content. Bright scenes draw significantly more power then darker ones. The searing hot gas (plasma) that illuminates the screen reaches temperature of at least 1200°C (2200°F). It the screen is pierced or cracked, the gas inside instantly cools down to prevent major injuries or fire. Typical power consumption is 400 watts for a 127 (50 in) screen, 200 to 310 watts for a 127 cm (50 in) display, when the TV is set to cinema mode.The lifetime of the plasma displyas is estimated at 100,000 hours of actual display time, or 27 years at 10 hours per day. This is the estimated time over wich maximum picture brightness degrades to half the original value.Answere these questions1. Why is this kind of TV called Plasma TV?2. How much electricity power does a plasma TV consume?3. What happens if the screen of the TV is pierced or cracked?4. Which one is brighter Plasma TV or LCD TV?5. What do you think of Plasma TV? (Give at least 3 opinions)
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