题目

More and more foreigners like to come to China. Last Friday our school was invited a foreign teacher in our city give a class to the students of Senior Grade Two. We found his class interested. I learned a lot from him. The teacher had a free talk to us with easy English . He spoke slow so that we could understand him well. Sometimes he repeated what we don’t understand. My classmates were all active in the class. To his joy, I understood everything the teacher said. And I was able to ask question in English. This class encouraged me very much. I’m sure that until we keep on practi 某一电容器标注的是“200 V，10μF”，则下述说法正确的是 A． 该电容器只能在200 V电压时正常工作 B． 两极间电压为100 V时，电容仍是10μF C． 使用时只需考虑工作电压，不必考虑电容器的引出线与电源的哪个极相连 D． 以上说法都不对