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