由于信度与测验长度有关,当一个测验有几个分测验时,分测验的分数与合成分数相比,()。
A.更加可靠
B.不如合成分数可靠
C.一样可靠
D.不确定
参考答案:B
Despite their______ of interest,Fleming kept trying to develop the chemical ______ it would be safe and effective.
A.lacking;in order to
B.lack;so that
C.lack;so as to
D.lacking;so that
(本小题满分10分)
设关于x的不等式lg(|x+3|+|x-7|)>a.
(1)当a=1时,解这个不等式;
(2)当a为何值时,这个不等式的解集为R.