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Almost
one-third
of
our
live-span,
we
participate
all
kinds
of
work
and labour.
Therefore,
continuously working
in
an
adverse
environment
or
over-worked
will
have direct effect
on our
health
condition.
Elements such
as
noise,
dust
and chemical gases
in
the
work
sites
may
endanger
the
health
of
the
workers.
These
elements are defined
as
"ProdLlction Hazardous
Factors", which
can
be
divided
into four
categories: physical
hazardous factors,
chemical
hazardous
factors, biological
hazardous
factors and
hu-
man
efficacy factors.
Early
discovery
and
recognition
of
the
dangers
of
these factors can
help
to
protect
our
health
as well
as
preventing the
risk of
certain occupational
diseases.
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