测量方法的可靠性也称为()
A.信度
B.效度
C.灵敏度
D.标准化
E.特异性
参考答案:A
太阳活动对地球产生的影响有( )
①干扰无线电短波通信
②扰动地球磁场,产生“磁暴”现象
③形成五带
④两极地区高空的一些极光
A.①②③④
B.①②④
C.②③④
D.①②③
______ him to do like this, he wouldn’t have made such a serious mistake in his
writing.
A.Did you persuade
B.Had you persuaded
C.If you should persuade
D.If you persuade