He often helps me _______ my physics. [ ]
A. with
B. to
C. in
D. for
答案:A
肠系膜下动脉分支有哪些()
A.右结肠动脉
B.左结肠动脉
C.中结肠动脉
D.直肠上动脉
E.乙状结肠动脉
铁塔安装施工进度有什么要求并如何控制?