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对二级负荷供电电源的要求是( )。
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变压器高压系统阻抗有名值0.8MΩ，归算到低压侧变压器高压系统电抗为( )。
以下程序用于求主次对角线之和。请填空。 main() static int a[][3]=9,7,5,1,2,4,6,8; int i,j,s1=0,s2=0; for(i=0;i＜3；i++) for(j=0．j＜3．j++) if(i==j) s1=s1+a[i][j]； if(______) s2=s2+a[i][j]； printf("%d\n%d\n",s1,s2);
交流限流式配电电器在极限通断能力实验时，限流电器的限流系数应不大于( )。
Today I want to help you with a study reading method known as SQ3R. The letters stand for five steps in the reading (36) ________: Survey, Question, Read, Review, Recite. Each of the steps should be done carefully and in the order mentioned. In all study reading, a survey should be the first step. Survey means to look quickly. In study reading, you need to look quickly at titles, words in darker or larger print, words with (37) ________ letters, (38) ________ and charts. Don’’t stop to read complete sentences. Just look at the important (39) ________ of the materials. The second step is question. Try to form questions based on your survey. Use the question words who, what, when, where, why and how. Now you are ready for the third step. Read. You will be reading the (40) ________ and important words that you looked at in the (41) ________, but this time you will read the examples and (42) ________ as well. Sometimes it is useful to take notes while you read. I have had students who (43) ________ to underline important points, and it seemed to be just as useful as note-taking. What you should do, whether you take notes or underline, is to read actively. (44) ________________. The fourth step is review. Remember the questions that you wrote down before you read the material. You should be able to answer them now. (45) ________________. Concentrate on those. Also review material that you did not consider in your questions. The last step is recite. (46) ________________. SQ3R — Survey, question, read, review, and recite.
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