一个品种与一个自交系杂交，或用一个品种与一个单交种杂交，都称为顶交。
Which two benefits are provided by using a hierarchical addressing network addressing scheme?（） [" reduces routing table entries"," auto-negotiation of media rates"," efficient utilization of MAC addresses"," dedicated communications between devices"," ease of management and trouble shooting"]
有关设计家的法律中，以（）最为重要 ["《中华人民共和国民法通则》","《著作权法》","《专利法》","《广告法》"]
氯化钠具有面心立方结构，其晶胞分子数是（）。 ["5","6","4","3"]
以下哪些情况适合用调查分析法进行预测（） ["顾客数量有限","调查费用不高","顾客意向明确","顾客意向不轻易改变"]
试述重型肝炎的治疗。
