时间：2011-02-23 15:20来源：蓝天飞行翻译 作者：航空 点击：次
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PCN abbreviation pavement classifica- tion number PDC abbreviation pre-departure clear-ance peak /pik/ noun the highest point . The intensity of solar radiation reaches a peak around noon. . peak value max-imum value PED abbreviation portable electronic device pedal /ped(.)l/ noun a foot-operated lever penalty /pen(.)lti/ noun 1. an unwanted result of an action . The pen-alty of using a circular polarisation transmission may be some loss of defi-nition. 2. a punishment or fine . Fuel penalties can be incurred if fuel surplus to requirements is carried. penetrant /pen.tr.nt/ noun some-thing which forces or gets entry into an area or substance . Penetrant dye inspection is a non-destructive test used mainly for the detection of defects open to the surface. . Penetrant oil can be used to loosen rusty bolts, etc. penetrate /pen.tre.t/ verb to force a way into . Cool air from the Atlantic can sometimes penetrate far into Europe. . Occasionally, thunder cloud will penetrate through the tropopause. penetration /pen.tre..(.)n/ noun the act of forcing a way into or through . Long-range radars are little affected by weather interference and have good cloud penetration characteristics. per /p, p./ preposition for each, for every . feet per minute (fpm) . gallons per hour (gph) per cent /p. sent/ noun the number out of each hundred . fifty per cent (50%) half or . or 50 out of 100 . twenty-five per cent (25%) one quar-ter or . or 25 out of 100 percentage /p.sent.d/ noun 1. a fraction with 100 as the understood denominator . Volumetric efficiency is usually expressed as a percentage. 2. part of the total . Only a small percent-age of passengers take in the pre-depar-ture safety briefing. perform /p.f.m/ verb to do . Cir- cuit breakers perform the same function as a fuse. . The pilot performed a loop to conclude his flying display. performance /p.f.m.ns/ noun the ability of a system such as an aircraft or an engine to function as required . The performance of the turbojet engine is measured in thrust produced at the pro-pelling nozzle or nozzles. period /p..ri.d/ noun a length of time . a 24 hour period . a period of 3 minutes
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