我国民间常有盐渍法来保存食品,其中生物学原理是 [ ]
A.食盐使细菌脱水死亡
B.食盐中缺乏细菌需要的营养
C.食盐中有杀菌物质
D.食盐可以使细菌毒素失效
答案:A
does he have to type the report on a computer, he has to get the computer to translate it into sounds.
A.Not only;but also
B.Either;or
C.Both;and
D.Not;but
与顶吹转炉相比,复吹转炉钢水锰含量显著增加的原因是()。
A.复吹转炉使钢和渣在炉内混匀时间短
B.复吹降低了钢中氧含量
C.复吹转炉成渣速度快
D.复吹比顶吹时间短