题型:选择题 Canada, Australia and New Zealand are all __________ countries. [ ]A. spoken English B. English spokenC. speaking English D. English speaking 查看答案
题型:填空题 图中的理想变压器原线圈接220V交流电压,副线圈A接4Ω电阻,B接一个“10V、24W”的电灯.已知A组线圈39匝,两端电压为6V,灯泡L正常发光,由此可见原线圈匝数为______,通过原线圈电流为______. 查看答案