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In a certain sock drawer, there are 4 pairs black socks, 3 pairs of back socks, 3 pairs of gray of gray socks and 2 pairs of corage socks. It socks removed at random without replaced, what is the minimum number of socks that must removes in order to ensure that two socks of the the same color have been removed?
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
Caking index of a coal is a measure of its
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Prothrombin time assay
The clay mineral with the largest swelling and shrinkage characteristics is
The disease caused by swelling of the membrane over spinal cord and brain is
Causes of bilateral le swelling does not always include: