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15755 views	0 answers	What are the different types of thermometers? updated 7 years ago by attemptnwin
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14445 views	0 answers	What are the various types of chemical substances? updated 8 years ago by attemptnwin
13985 views	0 answers	What are photochromatic or photochromic glasses? updated 7 years ago by attemptnwin
13970 views	0 answers	What is meant by natural resources ? updated 7 years ago by attemptnwin