var query = (from s in dbo.CadFlange where s.FlaSys='JIS B2220-2004'
&& s.flatyp ='带颈对焊' && s.flafac='突面(RF)'
group s by s.flapre into g
select new{
minID= g.Min(p=> p.id),
distinctFlapre = g.Distinct(p=> p.flapre)
}).OrderBy(x=> x.id) ;
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