当交流电源电压加到变压器一次绕组后,则以下说法正确的有() A 在一次绕组中会有直流电流通过 B、在一次绕组中会有交流电流通过 C 变压器铁芯中的交变磁通会同时穿过一次绕组和二次绕组 D 变压器铁芯中的不变磁通会同时穿过一次绕组和二次绕组
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【单选题】Smoking, which may be a pleasure for some people, is a serious source of discomfort for their fellows. Medical authorities express their【B1】about the effect of smoking on the health not only【B2】those ...