Who is responsible for summing up all the arguments?

___________, for a healthy heart, you must take some exercise and stop smoking. A: To summed up B: To summing up C: Sum up D: To sum up

_______, for a healthy heart, you must take some exercise and stop smoking. A: To summing up B: To sum up C: To a sum up D: To summed up

The scientists of the research center keep the good habit of summing up their experience ______ time to time.

It is not advisable just to ______ without making a timely summing-up of experience. A: work away B: work up C: work out D: work off

What are the main elements in the Conclusion section? （ ). A: reviewing the literature B: stating the recommendations C: repeating the experimental design D: summing up the major findings

A summing integrator is an op-amp integrator that has （ ）.

The short run industry supply curve can be found by horizontally summing the short run supply curves of all the individual firms in the industry.

概念题：把单个的ss曲线相加得到行业的SS曲线（ summing individual ss curves to get industry SS）

________ a team A: look up B: ring up C: give up D: make up