a
____________________
-
stroke
engine
is
a
common
____________________
which
works
in
____________________
____________________
.
These
are
called
____________________
stroke
,
compression
____________________
,
____________________
stroke
and
____________________
stroke
.
In
the
first
step
,
the
air
and
____________________
enter
the
____________________
.
In
the
____________________
step
,
the
air
and
fuel
are
____________________
.
In
the
____________________
stage
of
a
four
-
____________________
engine
,
heat
and
____________________
ignites
the
____________________
.
Finally
,
in
the
____________________
stroke
,
the
exhaust
valve
opens
to
____________________
the
____________________
____________________
.
Source
:
Jim
D
.
Dearholt
?
Career
Paths
.
Mechanics
?
Express
Publishing
.
201
2
