Various sand - entraining fermentation tests suggested that sand - entraining ( 20 % of the amount of quality maternal fermented grains ) could increase top - grade product rate by about 5 % 經(jīng)過各種夾沙發(fā)酵試驗(yàn)表明,按投糧數(shù)20 %的優(yōu)質(zhì)母糟夾沙,可以提高優(yōu)級(jí)品率5 %左右。