“1230”作为电码代日。其中,()表示发电报日期,()用于凑成一组电码。
参考答案:12;30
—Tom speaks English. ____Jenny _____ English, too?
—Yes, she does.
A.Do ; speaks
B.Does; speak
C.Do ; speak
D.Does; speaks
在配对比较的符号秩检验中,如果有2个差数为0,则( )
A.对正秩次有0.5和1,对负秩次有-0.5和-1
B.对正秩次有2,对负秩次有-2
C.对正秩次有3,对负秩次有-3
D.0不考虑