We prefer using lubricant like between machine parts operating at high temperatures.
A
liquid
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B
solid
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C
gaseous
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D
grease
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E
oil
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F
graphite
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Solution
The correct options are B solid F graphite Graphite has a layered structure because of which it acts as a lubricant. Compared to liquid and oil-based lubricants, solid lubricants offer better lubrication and are more effective at higher temperatures.