变压器初级线圈和次级线圈的匝数比为50：1，当次级线圈中流过电流为5A时，初级线圈中 发布时间：2017-11-07 06:55 │ 来源：www.tikuol.com 题型：单项选择题 问题： 变压器初级线圈和次级线圈的匝数比为50：1，当次级线圈中流过电流为5A时，初级线圈中流过的电流为（）。A．250AB．5AC．1AD．0．1A
题型：单项选择题 完形填空。 On weekdays, Kitty gets up at six thirty. She __1__ breakfast at seven, and __2__ she goes to school __3__ her bike. She goes to school at seven thirty. She doesn't like __4__ . Classes begin at eight o'clock. She __5__ lunch at twelve. __6__ are over at three thirty, and she__7__ home at five o'clock. On Sundays, Kitty doesn't get up__8__ . She gets up at about eight o'clock, and __9__ breakfast with her family. Her father and mother like to__10__ breakfast late on Sundays.( ) 1. A. is ( ) 2. A. then ( ) 3. A. by ( ) 4. A. late ( ) 5. A. is ( ) 6. A. Class ( ) 7. A. gets to ( ) 8. A. early ( ) 9. A. goes ( ) 10. A. having B. are B. after B. on B. be late B. are B. Classes B. get B. late B. drink B. have C. has C. before C. with C. to be late C. has C. School C. gets C. be early C. makes C. has D. have D. when D. / D. to be late for D. have D. Schools D. get to D. be late D. gets D. hasing 查看答案
题型：单项选择题 （A、2、Y）下列叙述正确的是（）A.每个轨道区段均设有QJJB.只有道岔区段才设有QJJC.每个道岔区段及列车进路中差置调车信号机之间的无岔区段均设有QJJD.每个道岔区段及列车进路中的无岔区段均设有QJJ 查看答案