As a businessman he was a success, but as a husband he was________failure, so their marriage ended

in________failure.[ ]

A. /; /  

B. /; a

C. a; a  

D. a; /

企业内部一般会自上而下地存在三个管理层次，其中最高层是

A．操作控制层

B．管理控制层

C．战略计划层

D．业务实施层