有關防腐 (填字)

填字
1)freezing: foods are frozen at-----------------------degree and bacterial action
is thus--------------------
2)Most frozen foods are threated by---------------.
3)Bottling and canning:
(i)The foods are cleaned , ------------- to destroy enzymes.
(ii)The filled bottles or cans are --------by heating again.
(iii)Food are usually blanched in -------------- water or by steam
U.H.T: milk is heated at ---celcius degrees for -----seconds.
(iv) the foods are heated to remove air, then sealed in---------------
4)addiction
add ---------,---------,----------- to foods can keep the micoorganism or enzymes inactive or destroy them