Friction
can
be
reduced
by
using______
(a) Oil
(b) Grease
(c) Powder
(d) All
of
these
Share
Friction
can
be
reduced
by
using______
(a) Oil
(b) Grease
(c) Powder
(d) All
of
these
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oil and grease
Explanation:
oil is slippery substance
Answer:
all of these
Explain :
( oil,grease, powder) all of them have smooth surface