问卷的信度反映了调查的()问卷的效度反映了调查的()
A.特异性
B.稳定性
C.真实性
D.可信性
E.敏感性
参考答案:C,B
-------- I had a really good weekend at my uncle’s.
-------- ______________.
A. Oh, that’s very nice of you.
B.Congratulations.
C. It’s a pleasure.
D. Oh, I’m glad to hear that.
变压器不能用来变换( )。
A.交流电压
B.交流电流
C.相位
D.频率