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measurement measurement /me"əmənt/ noun 1.
an act of measuring
Measurement of
relative humidity is done using an
instrument called a hygrometer. 2. the
result of measuring
The measurements
of the room are: height = 4
metres, length = 10 metres, width = 4
metres.
147 mental
mechanical mechanical /m|knk(ə)l/ adjective
referring to machines
Activation
may be electrical or mechanical. 
mechanical pump a pump operated by
the engine rather than by electrical
power
mechanical advantage mechanical advantage /m|
knk(ə)l əd|vɑntd"/ noun the ratio
of the output force produced by a
machine to the input force
mechanical engineering mechanical engineering /m|
knk(ə)l end"|nərŋ/ noun the
study of design, construction, and use
of machinery or mechanical structures

She gained a degree in mechanical
engineering from university.
mechanical linkage mechanical linkage /m|knk(ə)l
lŋkd"/ noun a system of rods, cables
and levers in a light aircraft, which connect
the control column in the cockpit to
the control surfaces on the wings, tailplane
and fin
mechanics mechanics /m|knks/ noun 1. the
study of the action of forces on matter
or material systems 2. the way something
works
The mechanics of the
föhn wind provide a good illustration of
the adiabatic process.
mechanism mechanism /mekənz(ə)m/ noun 1.
the arrangement of connected parts in a
machine or system
the landing gear
mechanism
the nose wheel steering
mechanism 2. a physical process
the
mechanism by which thunderstorms
develop
MEDA MEDA abbreviation military emergency
division aerodrome
medical certificate medical certificate /medk(ə)l sə|
tfkət/ noun a document which confirms
that the named person has been
medically examined and declared to be
in good physical condition
medical emergency medical emergency noun a situation
when somebody is unwell and
quickly needs medical care
medium medium /midiəm/ adjective referring
to something that has a position or
represents a condition midway between
extremes
high, medium and low frequencies

medium level cloud  noun a
substance through which something
else is transmitted or carried
Tubes
convey the cooling medium.
The cooling
medium for cooling oil can be ramair
or fuel.
medium frequency medium frequency /midiəm
frikwənsi/, medium frequency
band /midiəm frikwənsi bnd/
noun radio frequency range between
300 kHz and 3000 kHz – often referred
to as medium wave (MW). Abbreviation
MF
mega- mega- /me$ə/ prefix large. Opposite
micro- (NOTE: The prefix mega- is used
in front of SI units to indicate one million:
megahertz = one million hertz.)
megahertz megahertz /me$əh%ts/ noun a
measure of frequency equal to one million
cycles per second. Abbreviation
MHz
melt melt /melt/ verb to become liquid by
heating
Ice melts at temperatures
above freezing.  melting point temperature
at which a solid turns to liquid

Magnesium has a melting point of
1204°F.
member member /membə/ noun 1. a large,
important structural unit
The skin in
bonded to the internal members.
A
beam is a member which is designed to
withstand loading applied at an angle
to it, often perpendicular. 2. a person
who joins a club or organisation
He is
a member of the gliding club. 3. a person
in a team or crew
Most large passenger
aircraft are now operated by two
crew members.
memorise memorise /meməraz/, memorize
verb to fix in the memory, to learn by
heart
It is helpful if a student pilot can
memorise certain items, such as downwind
checks, early in his training.
memory memory /mem(ə)ri/ noun 1. the
mental ability of remembering and
recalling past events or information 
he has a good memory he remembers
things easily 2. part of a computer
which is used for the fast recall of information

The computer cannot run
many programs at the same time
because it doesn’t have enough memory.
mental mental /ment(ə)l/ adjective referring
to the mind or brain
Anoxia severely
limits physical and mental performance.
 mental calculation a calcula-
　
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本文鏈接地址：Dictionary of Aviation下(14)