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2024年5月10日 · Definition. Ideal case. A piece of resistive material with electrical contacts on both ends. In an ideal case, cross-section and physical composition of the examined material are uniform across the sample, and the electric field and current density are both parallel and constant everywhere.
- ρ
- ohm metre (Ω⋅m)
- kg⋅m³⋅s−3⋅A−2
1 天前 · Mains electricity by country. Mains electricity by country includes a list of countries and territories, with the plugs, voltages and frequencies they commonly use for providing electrical power to low voltage appliances, equipment, and lighting typically found in homes and offices. (For industrial machinery, see industrial and multiphase power ...
2 天前 · The Battle of Mogadishu (Somali: Maalintii Rangers, lit. 'Day of the Rangers'), also known as the Black Hawk Down Incident, was part of Operation Gothic Serpent.It was fought on 3–4 October 1993, in Mogadishu, Somalia, between forces of the United States—supported by UNOSOM II—against the forces of the Somali National Alliance (SNA) and armed irregular citizens of south Mogadishu.
2 天前 · Copper is a chemical element; it has symbol Cu (from Latin cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a ...
2 天前 · A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and ...
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3 天前 · Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster, and is a tetravalent metalloid and semiconductor. It is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, lead, and flerovium are below it. It is relatively unreactive ...
