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Olympiad-Science
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Class 7
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Q)
Which of the following is not a source of waste water?
(
a
)
S
e
w
e
r
s
(
b
)
H
o
m
e
s
(
c
)
I
n
d
u
s
t
r
i
e
s
(
d
)
H
o
s
p
i
t
a
l
s
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