The meal even played its part in _____.
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After the war, fish & chips went to top market and found its way onto the ____________of all classes.
With fish stocks under threat, to feed our appetite in the future, we are going to _______________as well as our favorite cod fish.
1. 一个数如果恰好等于它的因子之和,这个数就称为“完数”。例如6=1+2+3。编程找出1000以内的所有完数。