属于医疗保险的给付方式有( )
A．物质给付 B．现金给付 C．福利给付 D．疗养给付
参考答案：B
We all know that doing morning exercises ______. [ ]
A. is good for our healthy
B. are good for our healthy
C. are good for our health
D. is good for our health
电压互感器的变比，等于一次额定电压与二次（）的比值
A.最高电压
B.额定电压
C.最低电压
D.平均电压
