在一般电子点火系中，发电机式信号转子感应线圈输出的是（）
A.直流电压
B.交流电压
C.整形后的直流电压
D.整形后的交流电压
参考答案：B
Smith was overweight, so the doctor urged that not only _______ have less fat and meat,but also he _______.
A．should he; take exercise
B．must he; takes exercises
C．he can; does some exercises
D．he ought to; do some practice
以人为本的( )是人类对现代化实践在认识上不断深化的结果，代表了当今世界关于发展问题认识的新高度。
A．主导发展观
B．远景发展观
C．根本发展观
D．综合发展观
