A. shown at the bow B. white in color C. shown in addition to the stern light D. an all-round light
A. 个别资本成本率 B. 综合资本成本率 C. 加权资本成本率 D. 边际资本成本率
A. 平流式沉淀池 B. 斜板脉冲沉淀池 C. 气浮沉淀池 D. 平流式沉淀池