临床急需10 %葡萄糖注射液500ml。试问如果用50%葡萄糖注射液和5%葡萄糖注射液混合制成，各需要的体积是

A．50.6ml, 450.4ml

B．53.6ml, 446.4ml

C．55.6ml, 444.4ml

D．58.6ml, 441.4ml

E．60.6ml, 439.4ml