【单选题】某电动机的额定频率是50Hz,转速为1455r/min,则其转差率为( )。
【简答题】某台频率为50HZ,12极的三相电动机其额定转差率为5%,求该电动机的额定转速是多少?
【判断题】负载作三角形联接时,线电流必为相电流的 倍。( )
【单选题】The table is too small for a dinner party. It'll only seat four guests ______ comfort.
【简答题】书面表达。 Write a review of Kong Ximngdong's concert. Use the information given in the table as well as your own imagination. There should be four paragraphs,including the following four parts. 1)backgrou...
【简答题】“Where is Papa going with that ax (斧子)?” said Fern to her mother as they were setting the table for breakfast. “Out to the hoghouse,” replied Mrs. Arable. “Some pigs were born last night.” “I don’t se...
【单选题】某电动机的额定频率是 50Hz ,转速为 720r/min ,则其转差率为( )。
【单选题】对于首相水锤而言,机组导叶或阀门采用直线关闭规律,其进口断面水锤压力的变化规律