曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
aneroid capsule mechanically connected
to a pen.
UVUV abbreviation ultraviolet
V
vacuum /vkjum/ noun a space
completely empty of everything including
air If the fuel tank vent pipe is
blocked, a vacuum will form in the tank
and fuel flow to the engine will be
restricted.
valid /vld/ adjective 1. having official
force or effect All passengers
should have valid passports. 2. worth
taking seriously, acceptable because it
is true or well-based Significant
weather charts use abbreviations and
symbols to illustrate en route weather
phenomena and are valid for a specified
time. a valid assumption a wellbased
supposition
validity /və|ldti/ noun the state of
being valid the period of validity of a
visa Aerodrome forecasts included in
VOLMET should have a validity period
of 9 hours.
valley valley /vli/ noun an area of lowlying
land between mountains or hills
An example of a valley wind is the Mistral.
value value /vlju/ noun 1. a quantity
shown as a number Deviation is not a
constant value but varies from one aircraft
to another. 2. the quality of being
useful or desirable the value of doing
something the usefulness or worth of
doing something
valve valve /vlv/ noun a mechanical
device for controlling the flow of a fluid
valve overlap valve overlap /vlv əυvəlp/
noun the period when both the exhaust
and inlet valves are open together, with
the exhaust valve closing and the inlet
valve opening
valve seat valve seat /vlv sit/ noun an
angled ring in the cylinder head on
which the poppet valve sits when closed
vane vane /ven/ noun a flat surface acted
on by the wind or an airflow A centrifugal
compressor consists of a disc on
which is formed a number of radially
spaced vanes.
vapor vapor /vepə/ noun US same as
vapour
vaporise vaporise /vepəraz/, vaporize verb
to turn into vapour Water vaporises
when heated.
vapour vapour /vepə/ noun the gaseous
form of a liquid Over desert areas, the
lack of water vapour in the atmosphere
produces cold nights. (NOTE: It is also
written vapor in US English.)
vapour lock vapour lock /vepə lɒk/ noun a
blockage of fuel flow from a tank
caused by a bubble of vapour at a high
point in the pipeline
vapour trail vapour trail /vepə trel/ noun a visible
trail of condensed vapour left
behind by an aircraft flying at high altitude
variable variable /veəriəb(ə)l/ adjective
changing or changeable Winds are
more variable in the northern hemisphere
than in the southern hemisphere.
variable geometry variable geometry / veəriəb(ə)l
d"i|ɒmətri/ noun technology which
allows the angle between wing and
fuselage to be altered to give a more or
less swept wing for better high-speed
and low-speed flight characteristics
variable-geometry variable-geometry / veəriəb(ə)l
d"i|ɒmətri/ adjective referring to an
aircraft with hinged wings that can
move backwards or forwards during
245 venturi
flight (NOTE: The wings are swept back
to give low drag in supersonic flight and
are moved forwards for takeoff and
landing.)
variable pitch propeller variable pitch propeller
/ veəriəb(ə)l ptʃ prə|pelə/ noun a
propeller with a mechanism to change
the blade angle, to suit flight conditions
variable-sweep variable-sweep / veəriəb(ə)l
swip/ adjective same as variablegeometry
variation variation / veəri|eʃ(ə)n/ noun 1. a
change or the amount of a change 2. the
angular difference between magnetic
north and true north, which is measured
in degrees and is named east or west
according to whether the north-seeking
end of a freely suspended magnet lies to
the east or to the west of the true meridian
at that point variation east, magnetic
least: variation west, magnetic
best a mnemonic to help somebody
remember whether to add or subtract
variation
variety variety /və|raəti/ noun a lot of different
things Display units provide a
wide variety of information relevant to
engine and other automated systems
operation.
variometer variometer / veəri|ɒmtə/ noun an
instrument used for measuring the rate
of climb of an aircraft such as a glider
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Dictionary of Aviation下(101)
