下列各项，具有“慓疾滑利”特点的气是（）
A.卫气
B.营气
C.元气
D.宗气
E.清气
参考答案：A
已知R1=2Ω，R2=6Ω，将它们串连接到电压为12V的电路中，则I1：I2= _________ ，U1：U2= _________ ．
A total of 40 brand X television sets and 80 brand Y television sets were purchased for a motel chain. If the price of each brand Y set was twice the price of each brand X set, what percent of the total bill was the price of a brand Y set ？（）
A．0.25%
B．0.5%
C．0.625%
D．0.833%
E．1.0%
