属于非参数检验方法的是( )
A．t检验
B．
检验
C．方差分析
D．秩和检验
参考答案：D
21÷3.6的商保留到百分位约是5.84______．
Mary, I should tell you it is the third time that you________ your homework. [ ]
A. forgot to do
B. forgot doing
C. have forgotten to do
D. had forgotten doing
检验
检验