题目内容

Microorganisms available for traditional fermented food include（）

A. Fungus
Bacterium
C. Yeast
D. Mould

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Sodium benzoate is only effective in acidic media, so benzoic acid and its salts are often used in highly acidic foods, and combined with low temperature sterilization to play a preservative role.

Peroxides and chlorine preparations are oxidized preservatives. Sulfurous acid and its salts belong to the category of reduced preservatives.

The following substances can be used to make fresh-keeping agent :（）.

A. Paraffin oil
B. Chitin
C. Rosin
D. Whey protein

The following water-soluble antioxidants are ( ).

A. L-ascorbic acid
B. isoascorbic acid
C. tocopherol
D. phytic acid