在有关“形”的认识中，将“形”分为两大类，即（）。 ["现实形态与自然形态","自然形态与人为形态","自然形态与理念形态","现实形态与理念形态"]
Which statement describes the rule of split horizon?（） [" Only router can split boundaries(horizons)between concentric networks."," All distance vector protocols require fall routes that may cause momentary loops as the topology changes."," Networks can only remain fully converged if all information about routes is sent out all active interfaces."," Information about a route should not be sent back in the direction from which the original update came."," Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary."]
请简要阐述提高种蛋孵化率的综合措施。
简述T细胞、B细胞的免疫功能。
六分法来源于？
简述漂白充胶处理（B货）翡翠的鉴定特征。
