18.  The spy caught ______ the military base was sentenced to 20 years in prison and was limited ______ no relative visiting.

A．to spy on; to

B．spying on; to

C．to spy on; with

D．spying on; with

某项目设计年生产能力为20万件产品，年固定成本为100万元，变动成本率60%，销售税金及附加率为15%，已知单位产品价格为100元，则该项目的盈亏平衡生产能力利用率为( )。

A．15%

B．45%

C．20%

D．75%