如图所示的变压器，U1=220V，N1=1200匝，U2=36V，N2约有（）匝。
A．200
B．220
C．240
D．260
参考答案：A
— When and where was the famous Chinese player bom?
— He was born ______ July1981 ________ Ji'nan.
[ ]
A. at, in
B. in, at
C. in, in
D. on, in
实行民族区域自治制度的核心是[ ]
A．高度自治权
B．自治权
C．区域自治
D．一国两制
