As people’s living standards improve, the health and beauty business is _____ with more sophisticated products than ever before. A. astonishing B. flourishing C. exaggerating D. diminishing B. flourishing C. exaggerating D. diminishing
【简答题】如图所示的电路中,若电路出现以下情况时,用万用表测量的输出直流电压应为多大? (1) 二极管V 2 和电容C均开路时,V L =____V (2)只有电容C开路时,V L =16.2V (3)只有负载R L 开路时,V L =____V (4)电路正常工作时,V L =____V (5)只有二极管V 2 开路时,V L =____V