निम्नलिखित में से किसका उप – McqOptions

MCQOPTIONS

1.	निम्नलिखित में से किसका उपयोग स्नेहक के रूप में किया जाता है?
A.	सीसा
B.	सिलिका
C.	आयरन ऑक्साइड
D.	हीरा
Answer» B. सिलिका

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