| http://www.w3.org/ns/prov#value | - Still another ceramic substrate according to the present invention is a substrate comprising a glass and a crystal, which contains a MgO--Al.sub.2 O.sub.3 --SiO.sub.2 --B.sub.2 O.sub.3 --R.sub.2 O base glass(R:alkali metal) as the glass, and a
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