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Q. |
Which of the following is the most widely used heat insulating material for pipelines carrying steam? |
A. | Tar dolomite bricks followed by asbestos |
B. | Fireclay refractory followed by aluminium sheet |
C. | Cotton followed by aluminium foil |
D. | 85% magnesia cement and glass wool |
Answer» D. 85% magnesia cement and glass wool |
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