PWM型晶体管调压器其技术先进之处是：（）
A、调节激磁电流的大小
B、稳定发电机电压
C、减小激磁绕组的功率损耗
D、减小功放管的功率损耗
参考答案：D
The recent creation of indexes tracking both stocks and bonds provides better benchmarking information for which of the following portfolios()
A. sector index funds.
B. the typical stock mutual fund.
C. investment funds broadly diversified across asset classes.
饭店应按怎样的顺序进行利润分配？
