The
____________________
is
a
____________________
that
allows
both
____________________
and
interrupting
the
____________________
of
a
____________________
energy
to
its
final
action
voluntarily
.
In
a
____________________
,
for
example
,
it
allows
the
____________________
to
control
the
____________________
of
____________________
from
the
____________________
to
the
____________________
.
