【简答题】烷烃分子中碳原子均为( )杂化,碳碳键和碳氢键都是( )键。
【简答题】《经传释词》是一部收录虚词的词典,由清人 ( ) 编著
【单选题】在审核中没有发现不合格项时,审核组长应()
【单选题】About the t distribution centered on 0,Which is wrong?
A.
The distribution is a cluster of curves.
B.
The distribution is symmetric .
C.
when v(degree of freedom) is identical , | t | is much bigger , P value is also bigger.
D.
The distribution is unimodal.