由离心泵和某一管路组成的输送系统，其工作点由泵铭牌上的流量和扬程所决定。
参考答案：错
失业保险具有“三位一体”的功能是？（）
A、保障失业人员基本生活
B、促进就业
C、扶持企业稳定岗位和转型发展
D、预防失业
A company issued a bond with a face value of $ 67831, maturity of 4 years, and 7 percent coupon, while the market interest rates are 8 percent. What is the unamortized discount when the bonds are issued
A．
B．
C．
