1. Because the number of parts processed per hour * processing hours = total number of parts. If the number of parts processed per hour remains the same, (total number of parts) and (processing hours) are in (positive) proportion.

2. The area of a right triangle is constant, and the lengths of its two right sides are inversely proportional.

3. Within 8 hours' working time, the time required for weavers to weave 1 rice cloth is directly proportional to the total number of meters woven.

4. If the letter X.y represents two related quantities and the letter k represents the pen value, then the inverse relationship is (x\y=k).

5. If the letter x.y represents two related quantities and the letter k represents the product, then the inverse relationship is (y=k\x).

6. If 8a=9b, then the (positive) ratio of A and B; If ab=5, then the (inverse) ratio of A and B; If a+b= 10, then a and b are (not) proportional.