After the deadly train crash on July, 23, many a netizen called on relevant senior officials to          their

directorship. [ ]

A. abolish

B. retire     

C. resign

D. abandon

影响违约损失率的主要因素包括（）。

A.清偿优先性

B.抵押品

C.借款企业的资本结构

D.公司所在行业

E.经济周期