题型:填空题 (7分)如图所示电路,电源电压相同.在甲图中,闭合开关S,电压表示数为4 V,电流表示数为0.4 A;乙图中,闭合开关S,电压表示数为6 V.求:(1)R1、R2的阻值;(2)乙图中电流表示数. 查看答案
题型:填空题 It's certainly hard work. But, ________, a man who wishes to have a career has to make a great many sacrifices. [ ]A. on the contrary B. on the other hand C. for another D. in addition 查看答案