单词 | pass |
释义 | pass [pas] AEROSPACE ENGINEERING 1. A single circuit of the earth made by a satellite; it starts at the time the satellite crosses the equator from the Southern Hemisphere into the Northern Hemisphere. 2. The period of time in which a satellite is within telemetry range of a data acquisition station. COMPUTER SCIENCE A complete cycle of reading, processing, and writing in a computer. GEOGRAPHY 1. A natural break, depression, or other low place providing a passage through high terrain, such as a mountain range. 2. A navigable channel leading to a harbor or river. 3. A narrow opening through a barrier reef, atoll, or sand bar. MECHANICAL ENGINEERING 1. The number of times that combustion gases are exposed to heat transfer surfaces in boilers (that is, single-pass, double-pass, and so on). 2. In metal rolling, the passage in one direction of metal deformed between rolls. 3. In metal cutting, transit of a metal cutting tool past the workpiece with a fixed tool setting. METALLURGY 1. Passage of a metal bar between rolls. 2. Open space between two grooved rolls through which metal is processed. 3. Weld metal deposited in one trip along the axis of a weld. MINING ENGINEERING 1. A mine opening through which coal or ore is delivered from a higher to a lower level. 2. A passage left in old workings for workers to travel as they move from one level to another. 3. A treatment of the whole ore sample in a sample divider. 4. A passage of an excavation or grading machine. 5. In surface mining, a complete excavator cycle in removing overburden. |
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