No one can understand the picture _________ by the little artist.          [ ]

A. was drawn      

B. has drawn      

C. drawn        

D. is drawn

离心泵的密封填料应切成小段，其长度与盘绕泵轴一周的长度相等，切口要成（）角搭接。

A.45。

B.55。

C.35。

D.25。