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不阻塞，持續維持吸力
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- 工業用吸塵器好評推薦
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Polyethylene terephthalate (or poly (ethylene terephthalate), PET, PETE, or the obsolete PETP or PET-P ), is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containers for liquids and foods, and thermoforming for manufacturing, and in combination with glass fibre for engineering resins. [5]
- (C₁₀H₈O₄)ₙ
- 10–50 kg/mol, varies
- > 250 °C (482 °F; 523 K) 260 °C
- Practically insoluble
Polytetrafluoroethylene is a fluorocarbon solid, as it is a high- molecular-weight polymer consisting wholly of carbon and fluorine. PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons exhibit only small London dispersion forces due to the low electric polarizability of fluorine.
- (C₂F₄)ₙ
- 0.25 W/(m·K)
- 2200 kg/m³
- 327 °C
Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.
Pneumonoultramicroscopicsilicovolcanoconiosis is the longest word in the English language. The word can be analysed as follows: This word was invented in the daily meeting from the National Puzzlers' League (N.P.L.) by its president Everett M. Smith. The word featured in the headline for an article published by the New York Herald ...
William Bradley Pitt (born December 18, 1963) is an American actor and film producer. He is the recipient of various accolades, including two Academy Awards, two British Academy Film Awards, two Golden Globe Awards, and a Primetime Emmy Award. One of the most influential celebrities, Pitt appeared on Forbes ' annual Celebrity 100 list from 2006 ...
Seven (often stylized as Se7en) is a 1995 American crime thriller film directed by David Fincher and written by Andrew Kevin Walker.It stars Brad Pitt, Morgan Freeman, Gwyneth Paltrow, and John C. McGinley.Set in an unnamed, crime-ridden city, Seven ' s narrative follows disenchanted, nearly retired detective William Somerset (Freeman) and his newly transferred partner David Mills (Pitt) as ...
Google Translate is a web-based free-to-user translation service developed by Google in April 2006. [11] It translates multiple forms of texts and media such as words, phrases and webpages. Originally, Google Translate was released as a statistical machine translation service. [11] The input text had to be translated into English first before ...
