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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permission /p.m..(.)n/ noun con-sent or authorisation . A passenger who is drunk can be refused permission to board the aircraft. permit noun /pm.t/ a document or pass that is proof of official permission to do or have something . You need a permit to enter the restricted area. . verb /p.m.t/ to allow . When oxygen mask are pulled down to the usable position, valves are opened which per-mit oxygen to flow. . Information passed to the operations department will be sufficient to permit the flight to be planned. Permit to Fly /pm.t t. fla./ noun a certificate issued by the Civil Aviation Authority in the UK for aircraft which do not qualify for a Certificate of Air-worthiness perpendicular /pp.nd.kjυl./ adjective at right angles or 90° to a base or a line . The vertical grid lines are perpendicular to the horizontal ones. . The air is acted upon by a force perpen-dicular to the isobars in the direction of low pressure. persist /p.s.st/ verb 1. to continue to exist . Snow cover tends to persist on north-facing slopes of mountains. 2. to continue without giving up . She per-sisted with her request until it was granted. persistence /p.s.st.ns/ noun 1. the fact of continuing to exist and not disap-pearing . The persistence and move-ment of cols is governed by the move-ment of the adjacent pressure systems. 2. the act of continuing to do something and not giving up . He managed to overcome his difficulties through per-sistence and hard work. personnel /ps.nel/ noun a body of people involved in a common pur-pose such as work . Smoke masks are available for use by personnel within the aircraft. PFCU abbreviation power flying con- trol unit PFD abbreviation primary flight dis-play phase /fe.z/ noun 1. a stage or part . An emergency situation may occur dur-ing any phase of the flight. 2. the rela-tionship between voltage and current . The CSDU (constant speed drive unit) drive shaft turns the permanent magnet generator and single phase AC (alter-nating current) is induced in the wind-ing on the stator. phase angle /fe.z .(.)l/ noun the difference between two periodic phenomena expressed as an angle
phase difference /fe.z
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