单项选择题

All of the following are the steps of canning food except ______.

A．cleaning and trimming raw food
B．sterilizing canned food
C．blanching vegetables that are to be canned
D．printing labels and packing the tins into boxes

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热门试题

单项选择题

Vacuum packing is to ______.

A．immerse food in very hot or boiling water
B．sterilize food
C．remove air from the cans
D．subject food to steam or boiling water

单项选择题

Food deteriorates during storage because ______.

A．necessary chemical preservatives are totally absent from it
B．it is infected with yeasts, moulds and bacteria
C．heat sterilization destroys infections present in it
D．it isn't fit for storage