時(shí)間：2011-03-11 23:11來源：藍(lán)天飛行翻譯 作者：admin 點(diǎn)擊：次
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A bistable multivibrator is called a flip-flop, and it is often used in digital electronics. bistatic radar. A radar system in which the transmitter and receiver use separate antennas and are usually located some distance from each other. bit. A binary digit (the word bit comes from the words binary digit). A bit, either a zero or a one, is the smallest particle of information in a binary digital system, and all digital information is made up of bits. Bits are usually written as 1 for yes, true, or high, and 0 for no, false, or low. BITE (built-in test equipment). A troubleshooting system installed in many modern jet aircraft. BITE monitors the engine and airframe systems and when a fault is found, isolates it and provides the maintenance personnel with a code that identifies the LRU, or line replaceable unit, that contains the fault. bitumen. A general name given to tar-like hydrocarbon materials. Bitumens are the last of the products left in the fractional distillation of crude oil. Asphalt and tar are two common bitumens. bituminous paint. A heavy, thick, tar-base paint used as a water and acid-resistant covering. Bituminous paint is used around battery compartments for lead-acid batteries and in some compartments of flying boat hulls and seaplane floats. black blizzard (meteorology). Another name for a dust storm. black box (electronic system). A term used for any portion of an electrical or electronic system that can be removed as a unit. In troubleshooting a system using flow charts, only the information entering and leaving the black box is given. In order to understand the device or system, it is necessary to know the input and output signals and the function of the black box, but it is not necessary to know its internal circuits. A black box does not have to be a physical box. black light. Ultraviolet light, or electromagnetic radiation whose wavelengths are just shorter than those visible to the human eye. Black light is used to excite certain fluorescent materials, such as some forms of oil and some rocks. When black light strikes a fluorescent material, it causes the material to fluoresce, or give off visible light. black body (radiated energy). An ideal body which absorbs all the light that falls on it. It appears perfectly black at all wavelengths because it does not reflect any wavelength of light. bladder-type fuel cell. A plastic-impregnated fabric bag supported in a portion of an aircraft structure so that it forms a cell in which fuel is carried. blade (helicopter rotor component). A rotating airfoil driven by a helicopter engine to produce vertical lift. blade (propeller component). A rotating airfoil driven by an aircraft engine to produce a thrust force approximately in line with the longitudinal axis of the aircraft. blade (turbine engine compressor component). A rotating airfoil which is part of an axial-flow compressor in a gas turbine engine. The compressor blades, driven by the turbine, accelerate the air as it flows through the engine. |
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