Sliver sulphate, tungsten disulphide, graphite, molybdenum disulphide, lead oxide are examples of

Sliver sulphate, tungsten disulphide, graphite, molybdenum disulphide,

1.	Sliver sulphate, tungsten disulphide, graphite, molybdenum disulphide, lead oxide are examples of
A.	boundary lubrication
B.	viscous lubrication
C.	solid lubrication
D.	none of the mentioned
Answer» D. none of the mentioned

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Sliver sulphate, tungsten disulphide, graphite, molybdenum disulphide, lead oxide are examples of

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