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board rule
noun
L'Hôpital's rule
name
8x8 rule
name
ruling gradient
noun
(rail
transport)
The
steepest
uphill
gradient
in
one
direction
on
a
section
of
railway
line,
which
determines
the
load
that
can
be
pulled
by
one
locomotive
over
that
section,
according
to
the
power
rating
of
the
locomotive.
A
typical
ruling
gradient
could
be
1:50
(2%).
The
ruling
gradient
can
differ
in
the
other
direction
on
the
same
section.
Cope's rule
preliminary ruling
noun
Allen's rule
name
An
ecogeographic
principle
broadly
stating
that
animals
adapted
to
cold
climates
have
relatively
short
limbs.
Specifically,
homeothermic
animals
in
hot
climates
have
low
volume-to-surface
ratios,
and
homeothermic
animals
in
cold
climates
have
high
volume-to-surface
ratios,
due
to
thermal
adaptation.
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