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S1: Machines have parts made of iron.P: They must be painted or chrome plated.Q: Some parts rub against each other.R: Iron gets rusted.S: They must be lubricated with oil or grease.S6: When the machine is not in use, it should be covered.The Proper sequence should be:

A. RQS
B. RPS
C. SRP
D. PQS
Answer» E.


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