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  1. 1 天前 · Hydrogen peroxide (H 2 O 2) is a nonplanar molecule with (twisted) C 2 symmetry; this was first shown by Paul-Antoine Giguère in 1950 using infrared spectroscopy.Although the O−O bond is a single bond, the molecule has a relatively high rotational barrier of 386 cm −1 (4.62 kJ/mol) for rotation between enantiomers via the trans configuration, and 2460 cm −1 (29.4 kJ/mol) via the cis ...

  2. 2 天前 · Mercury is the first planet from the Sun and the smallest in the Solar System. In English, it is named after the ancient Roman god Mercurius (Mercury), god of commerce and communication, and the messenger of the gods. Mercury is classified as a terrestrial planet, with roughly the same surface gravity as Mars. The surface of Mercury is heavily ...

  3. 2024年5月23日 · Intel 8035 – Single-Component 8-bit Microcontroller, 64 Byte RAM. Intel 8039 – Single-Component 8-bit Microcontroller, 128 Byte RAM. Intel 8040 – Single-Component 8-bit Microcontroller, 256 Byte RAM. Intel 8048 – Single-Component 8-bit Microcontroller, 1 KB ROM, 64 byte RAM, 27 I/O ports, 0.73 MIPS @ 11 MHz.

  4. en.wikipedia.org › wiki › PiPi - Wikipedia

    5 天前 · The number π (/paɪ/; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics. It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although ...

  5. 2 天前 · What links here Related changes Upload file Special pages Permanent link Page information Cite this page Get shortened URL Download QR code Statistical subregions as defined by the United Nations Statistics Division This is a list of countries and other inhabited territories of the world by total population, based on estimates published by the United Nations in the 2022 revision of World ...

  6. en.wikipedia.org › wiki › SwastikaSwastika - Wikipedia

    1 天前 · The swastika is a symbol with many styles and meanings and can be found in many cultures. The appropriation of the swastika by the Nazi Party is the most recognisable modern use of the symbol in the Western world. The swastika (卐 or 卍) is an ancient religious and cultural symbol, predominantly found in various Eurasian cultures, as well as some African and American ones.

  7. 3 天前 · Boston Custer, brother. James Calhoun, brother-in-law. Signature. George Armstrong Custer (December 5, 1839 – June 25, 1876) was a United States Army officer and cavalry commander in the American Civil War [1] and the American Indian Wars. [2] Custer graduated from West Point and, though characterized as an inept for having been last in his ...

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