时间：2011-03-11 23:11来源：蓝天飞行翻译 作者：admin 点击：次
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coordination fix (air traffic control). The fix in relation to the facilities which will hand off, transfer control of an aircraft, or coordinate flight progress data. For terminal facilities, the coordination fix may also serve as a clearance for arriving aircraft. copal resins. Hard, natural resins that come from trees grown in the East Indies, South America, and Africa. Copal resins are soluble in alcohol, linseed oil, and turpentine, and are used in the manufacture of some types of aircraft finishes. copilot (aircraft flight crewmember). A person who assists the pilot in flying an aircraft, but is not in command of the aircraft. coping saw. A small, wood-cutting handsaw that uses a replaceable blade only about 1/8-inch wide. The blade is held under tension in the jaws of a U-shaped frame that has a handle in line with the blade. Coping saws are used to cut curves in thin wood. copper. A ductile, malleable, reddish-brown, metallic chemical element. Copper’s symbol is Cu, its atomic number is 29, and its atomic weight is 63.546. Copper is one of our most important nonferrous metals. It is heavy, ductile, and malleable and has excellent electrical and thermal conductivity. Copper is used as a pure metal and as an alloy for other metals. One of copper’s widest uses is in the manufacture of electrical wire. copper brazing. A method of brazing in which copper is used as the filler metal. Steel parts to be brazed are put together with as little space as possible between them. Copper is melted along the edges of the steel parts, and as the molten copper wets the steel, capillary action pulls the molten copper between the steel parts. When the copper cools, it solidifies and forms a tight bond between the steel parts. copper-constantan thermocouple. A thermocouple combination used to measure temperatures up to about 300°C. Copper forms the positive element, and constantan, the negative. copper crush gasket. A copper gasket used to form a leakproof seal between components that operate at a high temperature. The gasket is made of a hollow copper ring formed around a ring of asbestos. When the component to be sealed is tightened down on the gasket, the asbestos compresses, and the surfaces press into the soft copper and form a leakproof seal. copper loss (electrical loss). Energy loss caused by heat produced when current flows through the windings of an electric motor. copper-oxide rectifier (electrical component). A rectifier that allows electrons to pass in one direction, but opposes their flow in the opposite direction. An oxide film is formed on a disk of copper, and a disk of lead is pressed tightly against the oxide. A barrier exists between the copper and the copper oxide that allows electrons to pass from the copper through the oxide to the lead; but they cannot pass from the lead through the oxide and the barrier to the copper. copperweld (electrical wire). A high-strength electrical conductor made by plating a steel wire with copper. Copperweld is used for high-voltage transmission line, and for certain types of radio antenna where high strength is more important than maximum conductivity. |
