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5 天前 · The Northrop B-2 Spirit, also known as the Stealth Bomber, is an American heavy strategic bomber, featuring low-observable stealth technology designed to penetrate dense anti-aircraft defenses.
2 天前 · Established in 1936, Unit 731 was responsible for some of the most notorious war crimes committed by the Japanese armed forces. It routinely conducted tests on people who were dehumanized and internally referred to as "logs".
2 天前 · An HPV infection is caused by the human papillomavirus, a DNA virus from the papillomavirus family. [8] Over 200 types have been described. [9] An individual can become infected with more than one type of HPV, [10] and the disease is only known to affect humans.
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.
6 天前 · The logarithm base 10 is called the decimal or common logarithm and is commonly used in science and engineering. The natural logarithm has the number e ≈ 2.718 as its base; its use is widespread in mathematics and physics, because of its very simple derivative. The binary logarithm uses base 2 and is frequently used in computer science .
2024年5月23日 · Overview. USB was designed to standardize the connection of peripherals to personal computers, both to exchange data and to supply electric power. It has largely replaced interfaces such as serial ports and parallel ports and has become commonplace on a wide range of devices.
1 天前 · In standard cosmological calculations, "matter" means any constituent of the universe whose energy density scales with the inverse cube of the scale factor, i.e., ρ ∝ a −3. This is in contrast to "radiation", which scales as the inverse fourth power of the scale factor ρ ∝ a −4, and a cosmological constant, which does not change with respect to a (ρ ∝ a 0).
